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Haven't tried it,but you should find silicone remover/cleaner at your local hardware store.Aaahh,crap! Get ready for a bunch of bad Pamela Anderson jokes...
i think i'd try a product from a quality paint shop and save the gasoline for the tank or just sniffing. . .the strongest thing i've ever tried on a painted surface was kerosene and i wouldn't do it again. There are too many products out there now that work to take these chances. 0.02
Unfortunately, anything you use that will remove silicon will also remove paint, flesh, and destroy your lungs with the resulting vapors. The nice thing about silicon is that you can easily cut through it with an exacto knife and when you get it down to little bits you can finish up with some goo-gone which smells terrible but I don't think it will eat up the paint.