Mick'nSarah
Junior Ranger
We had the same discoloring. Mick did polish it and wax it, and we have the cover off for the winter, and it looks close to new, but not quite. I have a feeling it will go back to being discolored, but hopefully not as bad as last time. I suppose we are one of the odd ones having looked under there, but we take the cover off when it is stored outside and keep the cover stored in the garage with the rain. We are hoping it will last a little longer, although we have noticed some of the foam is coming unglued from the back, and we need to tack that back down. It wasn't as bad as we thought.