So they don't get even a little wet. To be fair that's why I gave it 3 stars and not 1, the description specifically says it's cardboard so it's my fault I wasn't paying attention. I thought the inside was flexible plastic so since I'm a bit germ shy I wanted to clean it before putting my underwear in it (seems reasonable to me). I tried wiping them down with a damp cloth and soap. They completely dissolved. I warn people like me - they shouldn't be cleaned at all.
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