I've gone through and tediously cleaned it by hand using a magic eraser. Very, very tedious, but it works. After a few years of this, we gave up and paid to have all the caulking redone. It was needed, but also helped with it looking new again.
2011 Bighorn 3055RL, 2011 F350 DRW 6.7L 4x4 Diesel Lariat and Hensley TrailerSaver BD3, 1992 Jeep ZJ and 1978 Coleman Concord Pop-Up for remote camping
Dave & Renee plus (Champ, Molly, Paris, Missy, and Maggie in spirit), Mica, Mabel, and Melton