IF you have little or no success with the bleach "routine" , you can use a GREAT product to "repaint" the seat, I have used this product many times over the years ( to restore the finish on Florida "sun-burned" automotive dashboards ) AND interiors, I found it at Auto Body shop suppliers, but you can get it on-line too! I checked and they don't have YELLOW, in the color chart, but you might want to think about changing your color. IF you decide to go this route, BE SURE to follow the recommended procedures ! Good Luck.