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Oct 20, 2015 at 14:37 comment added Gert @JohnRennie, I have a chemlab. Yes, distilled water works the same in dissolving salty encrustation. Not all cloths/sponges are made of cellulose.
Oct 20, 2015 at 8:44 comment added John Rennie @Gert: I'm afraid this is wrong. Any lab technician can tell you that paper, cloths, etc soften in distilled water just as they do in your tap water at home. The effect is due to water breaking hydrogen bonds between the cellulose molecules in the cloth.
Oct 20, 2015 at 1:20 comment added Gert @TanMath: the stiffness is caused by these crusty deposits on the fibres of the cloth/sponge. Fresh water removes these. Deposits gone = reduced stiffness.
Oct 20, 2015 at 1:13 review Low quality answers
Oct 20, 2015 at 6:41
Oct 20, 2015 at 1:07 comment added TanMath But WHY does it soften up? That is the question
Oct 20, 2015 at 0:56 history answered Gert CC BY-SA 3.0