I am trying to clean up what's left of my floor boards so I can rust proof (corroless) and put in some sheet metal overlays. I am having trouble getting the floors clean, there is something like contact paper on the floor boards on both sides. It covers the entire floor pan. The factory paint is on top and unless this sticky stuff is pulling the paint up, there is virgin metal under it. Anybody ever run into this? I am having trouble getting it off the metal, any suggestions on how to remove it without a die grinder, I thought maybe a heat gun, any suggestions?