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Dear Jack,

If these are just pencil marks(Graphite pencil) Spray Nine should work well. If marks are from a "Sharpie or permanent marker" try acetone or lacquer thinner. But the porosity of the HDPE Starboard material may be defeating any kind of good cleanup.....Respectfully Submitted....X-Jet Boat Bill

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You might want to try a poultice. They use them to draw stains out of pourous surfaces such as granite and marble. You may have to make your own based on the composition of the stain, which is graphite. It is possible hot wax might do it.

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