Try "Simple Green" full strength from the spray bottle. Get one of those sponges that has a green scour pad on the one side. Spray the stuff full strength, let it sit a minute and start scrubbing gently.
Got old pine tar from the previous owner and black streaks off the rig. Used it on the underside of the awning to remove a brownish stain because it was put away wet and left to dry that way.
I have used this stuff ever since.
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Retired January 4th, 2018 Lynne & Jerry RVM 105
04 WBGO Itasca Sunova (Miss May) Blue Ox Tow Bar
15 Equinox (Noxi) 18 RAD Mini e-bike, 04 Tracker
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