I tried 2 coats of wax before going cross country this Sept on the front of the trailer and the truck. Cleaned them off a couple times on the way west, not bad the first time but after that it got tougher and took a good deal of scrubbing. When we got back home to MA a month later I had to resort to drier sheets. So waxing helps some but for the more stubborn cases use drier sheets. I tried the magic eraser vs drier sheets earlier this year, the drier sheets worked better for me. Wish they sold big ones.