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I wonder if we could vacuum pack the masks and put them in a sous vide, it would be a lot easier to implement than finding enough ovens for all of the masks.

As for the bleach leaving skin and respiratory irritants, maybe hypochlorous acid (HOCl) might be a good alternative?

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I tried this and was not happy with the results

The mask deformed, got wet, and I do not believe the mask got hot enough - it was cool, including the metal parts.

Yes, just make sure you still have good fit. If you put an air bubble in to keep the form, you will need to cook longer to compensate for insulating effects.

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