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Glad to hear you don't leave them in 24/7! I tried cleaning my stones (including a very pricey natural stone) in a similar solution with success a few times.

I think it was referring more to...

I have read that bleach weakens the resin used to bond synthetic waterstones, so not recommended for soaking water or cleaning.

Probably the safest way to clean mould from them would be detergent,...