I never washed mine. I would think one would need to be careful not to get them too wet because you don't want them to start steeping in liquid. Also there may be possible mold concerns...etc if stored improperly and they weren't completely dried.
In truth tho, I have no idea, I always like to take the side of caution and if I don't have to do something I won't.
โAccessing your existence before the current one is of no concern, all you need to know is open your Heart and just BEโ - A loving Entity from a Breakthrough
โTo question is good, but take delight in contentment as well, because always asking โWHY?โ too much can create a feedback loop into madness.โ - A concern Entity from a Pharma voyage.