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Science

How Often Is Everyone Washing Their Masks? (vice.com) 303

The CDC says to wash cloth face coverings after "each use," which leaves room for interpretation. From a report: The CDC notes that wearing a mask is a precaution to keep from spreading virus-carrying respiratory droplets to others. The idea is that if everyone wears a mask, the likelihood of the droplets getting sprayed around is much less. Each new study only provides further evidence that wearing face masks is a crucial component in slowing the spread of coronavirus. One recent paper, published by the Institute of Labor Economics in Germany, showed that masks may reduce the spread of COVID-19 by 40 percent. This is great, because wearing a mask is an easy thing to do, even if it's a little irritating. But as we accept masks as just another thing that must be worn in public, I have to wonder: What's the appropriate number to own -- and how often should they be cleaned?

Personally, I have one mask, which I bought in March from a friend on Instagram. I wash it when it "smells dirty" by swirling it around in a takeout soup container filled with hot water and laundry detergent, then hang drying it on my fire escape/backyard fence. The CDC has official guidelines on washing cloth face coverings that I'm not properly following. According to the CDC, a reusable cloth mask (versus the blue surgical masks and N95s, which are disposable and should be saved for healthcare workers) are to be washed on the warmest appropriate setting in a washing machine, or hand-washed in a solution of bleach and water. The CDC also says a mask should be "washed after each use." What constitutes a "use" isn't defined, and so how often one should perform the chore of cleaning their mask(s) is a bit of a gray area.

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How Often Is Everyone Washing Their Masks?

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  • by Bodhammer ( 559311 ) on Wednesday June 17, 2020 @12:22PM (#60193294)
    Front, back, inside, outside - I get four days that way!
    • I would do mine more often, but the zippers and ball gag make a lot of noise in the dryer, and people in the laundromat are starting to look at me funny.

  • Just make it self-disinfecting. https://robots-everywhere.com/... [robots-everywhere.com]
  • I made my mask and it uses disposable inserts.
    • In my family we each have a couple masks. Since it's become apparent that COVID-19 (like most other infectious organisms) doesn't survive all that long on most materials, we mostly just rotate the masks. Each one sits unused for a couple days, after which any virus which might have made it to the mask should be broken down or dead.

      We do wash them occasionally - but that's basically when we happen to think about it when we are already planning to do laundry.

    • by Luckyo ( 1726890 )

      You still need to clean the outside contaminants if you're actually in contact with contaminants that get on the mask. Otherwise, you're simply increasing the contaminant load with every use.

      • You still need to clean the outside contaminants if you're actually in contact with contaminants that get on the mask. Otherwise, you're simply increasing the contaminant load with every use.

        I can't imagine this is that much of a problem, unless you're regularly hiking through Chernobyl.....?

  • by igor.sfiligoi ( 1517549 ) on Wednesday June 17, 2020 @12:28PM (#60193330)

    > The CDC also says a mask should be "washed after each use."
    Unless you are a health care provider (who chargers others for everything), or get out of the house only once a week, the above is highly impractical.

    Classical example on how to get your own advice ignored, because you strive for perfection instead of what is actually workable.

    • > The CDC also says a mask should be "washed after each use." ... or get out of the house only once a week, the above is highly impractical.

      How exactly is that so? Where I live there are freely available homemade cloth masks of much better quality than the cheap cotton ones sold in 7-11s throughout Asia. I've got two. I've also got a couple of cotton bandanas as well.

      I'm saving the two N95 masks for when or if I have to go to the ER.

      I use the cotton masks when I go to town to pick up groceries or mail, typically about four times a week. I use the bandanas for lower-risk situations like curbside pickup, pumping gas, and if I have to be outside around others.

      My rule is that a mask or bandana is good for exactly one trip to town. So I end up doing laundry about twice a week. As an added (largely psychological) measure I hang the masks in the sun to dry for at least one day, preferably two.

      This whole discussion is kind of silly. Masks are cheap and easy to make -- you can make perfectly suitable ones out of a t-shirt. If you go out more often than I do there isn't any reason you couldn't have more masks.

      • by skids ( 119237 )

        Assuming your mask has layers, just wash you hands if you touch the inside surface of a recently used mask, and wash the mask when it starts to smell like stale cornflakes, unless you like the smell of stale cornflakes.

        Usually I put on my mask and then a pair of light work gloves after that before entering the store, being careful to touch the gloves only on the cuffs. Then I go home and leave them in the car for a few days before using them again. By then, almost all of any virus on them will have died.

      • by dgatwood ( 11270 )

        The quality of the mask is no the only problem. As I understand it, when you wash masks, the size of holes between fibers increases, so the protectiveness decreases.

        IMO, rather than washing the mask, a better solution is having enough masks to use them no more than once a week or so. Any viruses that might be caught on the mask should be inactivated in a couple of days. Leaving them out in the sunlight should accelerate that process further. Thus, if you use the masks infrequently enough, you don't eve

    • You can get cloth masks for $2 each now at Target. Buy 14 of them and you only have to do the laundry every other week.

      The problem is if spit from a coronavirus infected person lands on your mask (which is better than it landing on your lip), it can start spreading through the fabric, and next time you put the mask on, you are putting on an infected mask. This is one reason the CDC recommended against masks in the first place, because they can actually increase your chances of exposure when you re-wear th
  • The first four letters of "droplets" is "drop". Which is what they do. Yeah, whatever, yes I know a cough or sneeze goes out very far. I never wore a mask because I didn't have a cough. If I had a cough, I WOULD STAY HOME.

    Now that my state governor has required that everyone wear a mask, I do. But what's happened now is that people aren't distancing anymore. I go to the grocery store and there's people all in my face again like nothing is happening. STOP IT. The handkerchief covering your rancid dis

    • Not just coughing - talking is enough to spread an airborne virus. And for some reason people do not seem to be able to go grocery shopping without bringing their significant other so they have someone to talk to.

      I always likened the danger of contracting an airborne virus to the possibility of smelling someone's bad breath. When someone has bad breath, no one knows until they start talking. And then you have to be at least 2 meters away to not be overwhelmed. Realistically, you want double that for

    • . I never wore a mask because I didn't have a cough. If I had a cough, I WOULD STAY HOME.

      The virus spreads by speech mate, check out this video to see how much spit comes out when you talk [youtube.com]. Coughing isn't even a major symptom of coronavirus.

  • Two jobs... (Score:5, Informative)

    by thatseattleguy ( 897282 ) on Wednesday June 17, 2020 @12:36PM (#60193364) Homepage
    As others point out here, the mask protects others from you, not just you from others.

    .
    Even if you never wash it, it's still doing the first job with 100% effectiveness. Washing once in a while makes it do the second job better as well - that's a bonus.

    (But then I live in a city where everyone cares about each other more than FreeDumb, so what do I know?)

    • As others point out here, the mask protects others from you, not just you from others.

      And cloth masks, anyway, are apparently much more effective at the former than the latter.

  • Comment removed (Score:4, Insightful)

    by account_deleted ( 4530225 ) on Wednesday June 17, 2020 @12:38PM (#60193400)
    Comment removed based on user account deletion
    • That said, trying to stop a virus with common cloth (even two layers) is like trying to keep the mosquitoes out of your yard with a chain link fence. The mask will be a little bit effective.

      In this case the point is to keep the mosquitoes in your yard, to prevent your infection from reaching others. And in that role a common cloth mask actually does prove to be quite effective.

    • by dissy ( 172727 )

      That said, trying to stop a virus with common cloth (even two layers) is like trying to keep the mosquitoes out of your yard with a chain link fence.

      If all the mosquitoes are cement glued to a basket ball, that chain link fence will work just fine.

      Alternate analogy, they are all 4 foot tall Australian mosquitoes, except unlike the ones in real life, these haven't yet figured out how to pick the lock on the gate :P

    • That said, trying to stop a virus with common cloth (even two layers) is like trying to keep the mosquitoes out of your yard with a chain link fence

      If it's diffuse in the air, the virus is small enough to get through even N95 masks. But the virus is mostly transmitted through droplets that can be stopped by common cloth masks.

  • I treat them as another article of clothing. Washing them more frequently isn't practical. Washing them less often is too risky.

    Just make sure you don't put it back on inside out after you take it off for a bit.
    • I figure everyone should have about 7 masks. Maybe more if you go out a lot. Maybe less if you are mostly at home.
  • by Cyberglich ( 525256 ) on Wednesday June 17, 2020 @12:42PM (#60193426)
    I bought 9 cloth masks i wear them for 1 day. at the end of 9 days i thow them all i my instant point and steam the crap out of them for 7 min (what i read online) then i use again till laundry day (every 2 weeks) and run them in my whites in laundry.. I have 10 more coth masks on order so i can have enought to make it between laundry runs.
    • by mellon ( 7048 )

      That's not overkill. You're doing all the right things. The thing about cloth masks is that they largely protect out, but also somewhat protect in. So if everyone wears them, then everyone is well protected. If only you are wearing one, you aren't very well protected, although it's better than nothing.

      The reason to wash the mask is because there might be virus on it from breathing in, and you don't want to handle that. So when you take it off, put on a new one, and treat the old one as infectious: don't sto

  • As I recall, 3M says that the P100 filters in my 6000-series respirator should be changed every month, or every 40 hours, or when breathing becomes harder due to clogging, whichever comes first. I may stretch that out to two months over the summer, since I only expect to use the respirator about three to four hours a week (grocery shopping and church). I should (and maybe actually do) wash/sanitize hands after every time I touch the filters.

    • Re:Respirator (Score:5, Informative)

      by iggymanz ( 596061 ) on Wednesday June 17, 2020 @01:28PM (#60193692)

      And you're wearing the wrong thing, since the intention of a mask is to protect others from droplets if you're infected. Your 6000-series has outflow valve that bypasses filters and so spews droplets at everyone. It's why those are NOT approved for medical use. Get a plain ol' cloth mask and do everyone around you a favor.

  • First, we are in a low-infection area of California. We're both telecommuting 100%. The one recreational outing I've had was to get a coffee with an immediate neighbor last Monday.

    We have 10 multi-layer cloth masks. On the rare occasion that we go out (non-delivery shopping, take-out meal), we wear the masks. When we get home, we throw them in the laundry. At no point have all our masks been in the laundry because we don't go out that frequently.

    We don't wear them while running (exercise), but we carry them

  • Seriously,

    The fabric masks are not blocking the virus but water droplets that carry the virus Now I didn't consider that the water droplets may dry out and virus may then be propelled outward but if you're infected and not showing symptoms then you're likely expelling them anyway. If you aren't actually infected then there is nothing really being gained by washing it more often.

    The biggest risk I think would be if you share the mask, otherwise wash when it's dirty.... is my take.

    • Every time you wash the cloth becomes a little more porous. You really want to minimize washing so that the cloth stays strong. If you want to disinfect, just leave it alone for a few days and any virus will have died. So 4 masks will be sufficient for most people. Now if the mask is dirty - this is another matter and washing is just fine.
    • Exactly. We've been told that there isn't a trace of the virus left on virtually any type of surface after just a few days and we know as well that you need to cross some threshold of viral particles in your system before you'll actually become infected (i.e. touching a contaminated surface and then putting your hand in your mouth does not guarantee you'll get infected, though obviously you shouldn't be playing with fire like that).

      If we look at it from the angle of not wanting to get sick, it's unlikely th

    • I think maybe if there is virus from outside *on* the mask that hasn't made it to you yet?

      I wash mine when it starts to smell bad, a week or two depending on what's happening (mostly use it to go inside restaurants and order).

      Of course, we already had covid, confirmed at the time as well as now with antibody tests. We didn't care in the first place before we had it, and we really only wear masks out of solidarity to make other people feel better. But at this point I mostly forget there is even a p

    • If someone spits small water droplets land on the mask, the virus can spread over the mask and eventually you will breath it in.

      Soap is incredibly good at killing the virus because the surface of the virus is a lipid layer, and soaps cut through grease.
  • by drnb ( 2434720 ) on Wednesday June 17, 2020 @12:47PM (#60193476)
    My cloth virtue signaling masks(*) came in a 3 pack. So I can just leave one or two on the car dashboard in the sunlight for sterilization.

    (*) Most are, they are little different than bandanas, they catch the heavy stuff during a cough, aside from that placebos to keep people calm. The faux surgical blues out of china are mostly virtual signaling too.
    • by mellon ( 7048 )

      Bandanas are fairly useless because the weave is so loose. Masks aren't virtue signaling—they prevent your outbreath from carrying droplets. You are signaling virtue in the sense that people can see that you are protecting them, and this will tend to make them think you aren't a complete asshole, which is always good. But you're signaling virtue because your action is virtuous—wearing a mask is not performative virtue signaling.

      The mask doesn't really protect you much at all, although it's bette

      • by drnb ( 2434720 )

        Bandanas are fairly useless because the weave is so loose.

        So is the weave in many *cloth* masks. Cloth masks are recommended by the CDC. They even specifically mention using cloth from bandannas, scarves, etc for those who want to make homemade masks.

        Masks aren't virtue signaling—they prevent your outbreath from carrying droplets.

        And bandannas perform that function as well. Not as well as a cloth facemark that "seals" better, which itself is very different and less effective than an actual surgical or N95 mask. The point being is the bandannas are *not* that different from other *cloth* masks people are making at home or buying online. I was d

    • The operative agent in sunlight which sterilizes is UV light. Most forms of glass block UV light [theglobeandmail.com], including windshield glass. So the only sterilization effect you're getting leaving stuff on the dashboard is due to the interior temperature of the car going up.

      if you want to UV sterilize naturally, the masks have to be hit by direct sunlight. No glass.
    • by Nidi62 ( 1525137 )

      My cloth virtue signaling masks(*) came in a 3 pack. So I can just leave one or two on the car dashboard in the sunlight for sterilization.

      Yep, summer in the South here. I let my mask bake on the dashboard of my truck. Should get hot enough to kill off any little baddies.

    • by dgatwood ( 11270 )

      Most are, they are little different than bandanas, they catch the heavy stuff during a cough, aside from that placebos to keep people calm. The faux surgical blues out of china are mostly virtual signaling too.

      That's not really true. A bandana is a single layer of fabric with a loose weave, which does very little. The more layers of fabric and the finer the weave, the more likely that tiny droplets will hit fibers and stick, rather than pass straight through.

      To give an analogy, hold up your hand at arm's

  • by JBMcB ( 73720 )

    I only use my mask when going out shopping, which is pretty much the only time I go out around a lot of other people. When not in use I leave it on the dashboard of my car to bake in the sun. From what I've read it's a pretty effective method of disinfecting something.

  • I didn't find a study for cotton but in terms of intermolecular forces it is similar to cardboard (fibers of cellulose) which here [nih.gov] is described as hosting intact virus particles for ~24 hours. (Personally somewhat skeptical that the virus is still going to be transmitted in an infectious load well before that.)

    You only need ~60C temp to very effectively sterilize (humidity also helps) so I usually just steam my masks under an iron and call it good.

    But if you are going out "frequently" the sterilization ma

  • Are millennials so fucking stupid that they can't work out what a use is? Have you put it on, worn it then taken it off? Then that's a use.
  • We just toss in the worn ones in the laundry and use the second set that day, is this really a thing?

  • by Baleet ( 4705757 )
    I get 10 or 12 trips to the store out of an N95 that hangs in a place where it gets direct sunlight between trips. Then I toss it. Got about 20 of them left. After that, if I can't get more, I might go with a half-face ventilator with disposable filters or a mask with a filter pocket that I can put a some nonwoven material in along with a MERV13 filter. I am not wearing to protect those knuckleheads who won't reciprocate by wearing their masks correctly. I am wearing to protect myself which, in turn, protec
  • If I wear it, it has been used. I use a mask only once, then it goes into a bucket to be washed. When there are enough in the bucket, I toss them into the clothes washer then the dryer.
  • I wash a mask I've been using every time I get home and wash my hands - washing both my hands and the mask at the same time. Then I just hang it up to dry (I have fabric masks).

    One of the most effective virus killers is soap and water, so the mask is well cleaned this way, plus the drying time ensures I won't wear it for a while after so it gets further isolation time.

    Mostly I don't go out of the house more than once a day, but I have a few masks in case I need to go out again (and I keep one in the car in

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