Sterilize, moisten with distilled water and seal.
Mold can‘t live in distilled water, for the same reason you cant live by drinking salttwater.
Time to edit because apparently this causing more confusion than i thought
– sterilize the sponge in any way, theres several methods
– moisten the sponge with distilled water. Distilling water kills most microorganisms
– furthermore many orgnaisms can‘t live in distilled water even if they contankmsted it after the distillation
– seal to prevent any microbes to get into the spongey
Admittedly seems i was wrong about why certain microbes can‘t live in distilled water. My idea was that it has the inverse effect of saltwater: instead of oulling water out of the cell it pulls water into the cell to equalize the saturation of minerals etc
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