Several years ago, a CWorld salesperson, in the course of conversation, told us about a wasp deterrent for rv's
. At one time or another, we all have, probably, had a wasp/mud dauber build its nest in a vent/ac unit or another port available.
He told us to go to any farm supply store and purchase Cow Tags .. those plastic tags you see on the ears of cattle .. They are bug deterrent like OFF is for us. Hang one of those items in each port or unit where these guys can find their way in. The will not choose your RV as their host. An inexpensive fix to a nuisance problem.