I had the same problem on my boat use 1 portion household bleach and 1 portion water let it soak a minute on stain and its gone(
Castrol Supercleaner can be found in the same aisle as car wax at Walmart in apurple gallon jug. It cleans all kinds of things really well!
I have used Soft Scrub, purchased in the grocery store and is used for about anything in the kitchen or bathroom.
Try Tuff Stuff. Found also in the automotive department. I have used this stuff for years to clean anything from patio furniture cushions to car floor mats. It is wonderful stuff and you will be amazed how good it works.
Try Westly's Wheel White .. it's found in the automotive section at most stores.. It's meant for cleaning the white walls on tires but works very well on most any white outdoor surface!
Good Luck to you!
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