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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There are 3 chemicals working together to provide moistened sponges. A surfactant, a softener, and a biocide. When I worked with sponges, magnesium chloride and quaternary ammonium did the job. These kinds of sponges are also supposed to be rinsed before use – which washes out the chemicals – which is why sponges never feels supple again, unless intentionally wetted.
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