Mythbusters did an episode on this subject, but can't recall what they said worked best. I know they said tomato juice worked alright, and I think vodka worked ok as well.

Gun it and run it!
1981 CJ5,258,T-176,D300,AMC 20,Dana 30,Trxus M/T 31x10.50, Rancho 5000's, GroundPounderFab front bumper, polyethylene gas tank, aluminum dash, AutoMeter gauges

What this country needs is unemployed politicians.