You could try a good cleaner wax. Meguiars and Mothers both make good stuff. It has a little grit in it and will clean while it waxes. If that doesn't work use a Mr Clean Magic eraser and I almost guarantee it will take it off. Warning though it will slightly scuff your Gel coat.
For your carpet, spot treating just just use Resolve, if you have a huge issue try a commercial cleaner vac.



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