The purple stuff is a degreaser/cleaner which is sold at auto parts stores. Alternatively try Home Depot Citrus cleaner concentrate full strength. The citrus cleaner really cleans black stains off my white hypalon dinghy.
Get Casterol degreaser and spray the bumpers. Let them sit for a minute and hose them off. Wear gloves and wax the bumpers when you are thru....WOW..IT works great. You can buy it (cheaply) by the gallon@ Wallmart for $5.00..It will cost you $6.00 per quart at other stores...I SWEAR BY IT!!!!!
if $5.00 Casterol does the job. I have two 12" fenders that stay on the dock. They make such a mess of the side of the boat that I finally made sunbrella covers for them. Can't wait to see if all that gunk will come off.
Some of the island girl products work well on bumpers forget which one I used, also on off, hull cleaner will do a job , but use it very carefully , avoid contact, it does not hurt the bumpers and will remove anything ,Mike
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