I've never washed figures from my collection, only the acacia tree.
But my kids have played with their Schleich critters in water and it didn't damage the painting. Instead, kids damaged their figures by throwing and pucnching them many times, but that's another story...
By the way, me and my son use the already damaged figures to play mini-soccer with them.
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Owners of miniature zoos on shelves, unite!
My collector's blog