It's rare that I get ash, but when I do, I wait until my soap is completely cured to remove it, because if I remove it much earlier than that, I've found myself having to remove it again once cured, which makes sense because ash is caused by water mixed with any bits of excess alkali evaporating out of the soap and reacting with the CO2 in the air. Ash that is washed off of a 3-day old soap may return since the newly made soap is still curing and evaporating off water.
IrishLass
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