Eldorado PR works. We used a gallon of it on our 31 footer, but didn't need to do the roof - no clear coat left there. We still have some clear coat that was stubborn and will need to do a little extra on some areas before we start to polish. Citristrip also works but not nearly as fast or easily (in our opinion). Aircraft stripper works too and that's what we'll be using to finish removing the clear coat in those stubborn areas. We were amazed that we actually had SO MUCH clear coat left on the lower parts of the trailer and had to do 2 coats in those areas and still have stubborn spots. Weather was against us when we did this a few weeks ago, so you might get better results with the first coat. We pressure washed to get the stripper off, and that worked very well.