How do sponges that come out of the package “pre-moistened” not grow mold/mildew?

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I just saw an ad for ScrubDaddy’s Damp Duster, and in the ad, they mentioned that the sponge will come out of the package squishy & damp. If it is left out, it will dry up. I’ve noticed this with other sponges too. What do companies “pre-moisten” their sponges with? Why isn’t it mildewy?

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