I noticed white granular stuff on the foor of the motor home one day. Didn't know where it came from. Cleaned it up.
A couple of weeks later I noticed this.
Something had chewed 4 out of 6 cold air return vents in the ceiling! I checked the roof top units and they are completely sealed. Nothing could have gotten in thru them.
I took off all the vents and checked out the shaft, and there's nothing dead in there, which is good. But where did it come from? And what could it have been?
I replaced the vent covers, and have had nothing since.