You can't really get rid of the virus with heat, I'm pretty sure, and if you disinfect some of the homemade masks (that have paper towels, etc.) in them, the paper will disintegrate.
And as far "a lot of data to show that universal mask wearing helps keep transmission rates down.", there's also this (summary below, entire article's long, but worth reading):
https://www.okctalk.com/showthread.p...25#post1112725
Data lacking to recommend broad mask use
We do not recommend requiring the general public who do not have symptoms of COVID-19-like illness to routinely wear cloth or surgical masks because:
There is no scientific evidence they are effective in reducing the risk of SARS-CoV-2 transmission
Their use may result in those wearing the masks to relax other distancing efforts because they have a sense of protection
We need to preserve the supply of surgical masks for at-risk healthcare workers.
Sweeping mask recommendations—as many have proposed—will not reduce SARS-CoV-2 transmission, as evidenced by the widespread practice of wearing such masks in Hubei province, China, before and during its mass COVID-19 transmission experience earlier this year. Our review of relevant studies indicates that cloth masks will be ineffective at preventing SARS-CoV-2 transmission, whether worn as source control or as PPE.
Surgical masks likely have some utility as source control (meaning the wearer limits virus dispersal to another person) from a symptomatic patient in a healthcare setting to stop the spread of large cough particles and limit the lateral dispersion of cough particles. They may also have very limited utility as source control or PPE in households.
Respirators, though, are the only option that can ensure protection for frontline workers dealing with COVID-19 cases, once all of the strategies for optimizing respirator supply have been implemented.
We do not know whether respirators are an effective intervention as source control for the public. A non-fit-tested respirator may not offer any better protection than a surgical mask. Respirators work as PPE only when they are the right size and have been fit-tested to demonstrate they achieve an adequate protection factor. In a time when respirator supplies are limited, we should be saving them for frontline workers to prevent infection and remain in their jobs.
These recommendations are based on a review of available literature and informed by professional expertise and consultation. We outline our review criteria, summarize the literature that best addresses these criteria, and describe some activities the public can do to help "flatten the curve" and to protect frontline workers and the general public.
We realize that the public yearns to help protect medical professionals by contributing homemade masks, but there are better ways to help.
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