You can try soft scrub put it all over it and let it set for awhile and then wash it off, it has bleach in it I use it on my sinks and it shines them up and make them white again. maybe like 15 min or longer sometime you can do it a second time. Sometimes things don't come out all the way the first time But give that a try I hope it works just make sure you put a good enough coat on it the first time. Good luck!