I've cleaned so many attys, and whatever those things that go in CE4s are called. Pretty funny, I haven't used one in so long I can't remember what they're called. Anyway, all had seals and coils and stuff and nothing was ever hurt. So I don't think putting a Reo in one would hurt. No harsh solvents but you know that.
I figure it like this, if I can put my finger in one while it's running and all it does is come out cleaner it's not going to hurt my metal reo. And I know your not talking about woodvils.