Many solvents could work. I suggest toluene, DCM, acetone, or xylene. Plain ole paint thinner might work too. If you have these solvents, just pour some over the paint and try to clean it up. If one doesn't work, try another. If you are wondering which solvent you should go buy to clean it up, I suggest one of the above. What kind of paint is it? Latex? Polyurethane?