What is the best way to de-ice slide-outs

I was caught in an ice storm about 200 miles from our destination a few years ago while in TX. We spent the night. In the morning everything on the north side of our trailer and truck was frozen and covered with ice. We started the truck with our remote start and let it run to thaw out the doors, then drove to Wally World. I purchase a garden tank sprayer, some windshield washer fluid and some isoprophyl alcohol. I added the alcohol to the washer fluid to increase its' melting ability. Sprayed all the rubber seals down and waited for them to loosen up enough to release from the sides so I could close them without tearing a seal. As I look back I probably should have just stayed another day and let nature warm them up for me..

B.O.