Good Luck
I have a '84 31' that had a lot of mildew when I bought it due to neglect. I bought a "green machine" by Hoover, I think, for about $75 at KMark or Wallmart. It's a portable upholstery cleaner, similar to a carpet shampooer.In the machine I have used every concotion known to man to get the mildew stains off. It's tough going. The best additive had been a mildew remover from West Marine. Yellow stuff in a spay bottle. Spray it, soak it, vaccuum it, spray it, soak, vaccuum it, etc., and curse a lot.Also, wear one of those masks for breathing while painting, etc. The fumes will get pretty rough.Dont' use a scrub brush in the hull liner tho. It will fray the fibers and leave it looking bad.Just spray, soak, spray, soak ...