Slide Out Seal Cleaning and Treatment
I read (on this forum) that you could use rubber roof cleaner to clean the seals and then use this Seal treatment on the rubber. I used a “Swiffer” with disposable pads to clean both sides of the seal beyond where I could reach, from the outside. My seals were a little difficult to get under and stay under, but I kept trying and eventually got them nice and clean. I then used the Swiffer and clean pads to apply the seal treatment. They now look great.