Driveway leaks??

My old tow vehicle(Jeep)which is now my work truck 135,000 miles and a little leaky on the NEW driveway. one of those door to door salesman came by with that driveway stuff and sprayed it on my oil leaks and it went away..THEN he opened the bottle and LICKED IT and said it was all natural. Anybody know of any tips on getting up old oil drips? I was thinking it had to be lemon or citrus juice?? Any ideas on how to get it up?? Jet

p.s. since he was a door to door salesman and came while I was eating I kicked him out without asking how much or getting his ph#. lol