Hello, Just bought a used pop-up and am starting to clean her up. Some mildew has built up on both the vinyl and canvas surfaces. What's the preferred way to clean these surfaces with out damaging the finish or causing permanent discoloring? Do the surfaces need to be re-conditioned after a thorough cleaning? Can I expect to get rid of all the mildew stains or do the become somewhat permanent? Also, any advice for re-caulking the two seams that run front-to-back along the left and right caps that attach to the roof segment? Appreciate any advice.