I just wash them off, and replant them in organic fertilizer free soil. I like real plants better because they really help with your humidity requirements. But it's okay to use fake plants as well. A lot of folks like to use the fake ones to fill in the spots that the real ones don't cover.
I didn't mean actual plants. Like to just use a branch for them to climb on. I've heard of boiling them and things like that but just wanted to know if there are any other ways to clean them