My new 1930 2-dr sedan

[atch]

Question: what do you use to remove gasoline from cowl when you spill some at the gas station?

Today when I filled this thing up I spilled gas (probably a tablespoon or two) on the cowl/tank top. By the time I got home it had evaporated but now I'd like to wash it off. What do you guys use?

Note: I have no idea what the paint is. I'm sure it has been repainted at some point, but who knows if it was back in the lacquer days, base/clear days, enamel days, etc., etc.

That seldom happens on late model cars, but having the gas cap where it's a bit less handy may pose problems for me down the road; maybe more so than today.