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if your brave enough u can take a stick or something and knock it off then run. They should leave after it falls down then u can scoop it out and scrape off the rest of it later after their gone for good.. This is a should work theory, im not positive though.. Good Luck
just use the spray.... soak them bitches and have a hose nearby to wash it off as soon as you hit it... You've never had one of those pumps that doesn't stop working right away and leaked gasoline on your car? Gas is probably more corrosive than bug spray, it'll be fine as long as you wash it off.
either that or go to a car wash with a pressure washer and spray the hell outa that.