I've heard mixed results using Simple-Green with 10% bleach mixed in - spray the awning down good with this stuff and then roll the awning up immediately... let it sit a couple days, then un-roll, wash with high pressure hose, and repeat. It might take a few applications...
The only thing I know of that dissolves tree sap immediately is Acetone - but I'm not so sure that would be safe to use on an awning.. Acetone has a tendency to eat plastics..
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Regards - Randy
Cedar Creek Cottage 40CFE
Thor Vegas 25.5
Randy’s Rod Shop & Fabrication
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