We used to have that happen back when coach's like yours were new, especially around the moldings. Do some experimenting in an area that's out of the way (like in a closet or something) with a small (travel?) iron set at it's lowest temp. That's how we handled it (at the factory's suggestion).
1997 37' HR Endeavor, 275hp Cat, Freightliner
03 CR-V Blue Ox, Ready Brake