I use bath towels.
They hold moisture well, but don't retain it for so long that it grows things. They're washable. They come in a million different colors.
The only thing you have to watch out for is the detergent you use to wash them. You must use a hypo-allergenic no dyes, no perfumes detergent. I also use a cup of bleach, even though they're darks, I'll still use the bleach to make sure any unwanted bugs are dead.
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