Also whats the best way to clean them.? (that might help a lot)
Mr. Clean Magic Eraser "double power" Those and some Westley's Bleche Wite Follow that up with some good vinyl conditioner and you'll be good to go, I recommend Meguiar's Gold Class Vinyl/Rubber Protector If all else fails, and you end up wanting or needing new threads, give me a callSkip