This is not to clean the sheep it’s to get rid of parasites that can irritate the sheep and cause a lower quality of wool. Imagine it like shampoo for lice.
I've read something that might alleviate your concerns. Allegedly this frightens the sheep on the first go, maybe a couple times after that too, but they pick up on how they aren't itchy after the bath, and visibly try to get dunked when it's time for the next splash.
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u/Technical-Prize-4840 6h ago
It might just be the color of wet wool, but they look whiter/cleaner going in than they do coming out to me.