Last weekend we made the last trip for the season. When got up Sun morn I noticed the bunk end was sweating like a Prom Queen in the back seat of a 65 Impala. So run my hand across the entire ceiling it was dry. Just the bunk end was damp. Temp was about 40 outside and I had the furnace on during the nite/morn. Here's the skinny. Is it okay to towel dry the end ? I plugged the portable light/ fan and run the fan that helped some. Opened the unit up when I got home and let it air. Advice appr. One other item I popped the cork on the hot water tank and blew the water lines out with 65 psi compressed air poured anti freeze into the traps and some down the Black water tank after I drained Grey and black. My question is do I need to put Anti into the potable tank and run the 12 volt pump? If so how much anti? Do I leave the cork out of the hot water tank or close it up? I don't run water thru the potable water tank and run the 12 volt on demand pump. Just use city hook up.