how to clean felted slippers?

hello, i am not really into felting myself but I was gifted a pair of needle felted slippers, they're super cute and look like shrimp which are my favorite animal.

he told me the etsy seller has no instructions on how to clean them and they're really comfortable but now I'm sorta scared to wear them bc all the stuff I see about cleaning felted stuff says you can't wash them. what's the best method of cleaning?