be careful with anything you use, but sometimes plain old gasoline can work wonders, however anything that is going to take it off is also not going to be too great for you paint, so after you use something clean it off right away with some water. Hope that helps, sorry to hear about the winter blues, good news though, I am getting my typical pains in my knees associated when spring is on it's way! Damn astroturf football fields!
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