Just found out about this stuff this past week. Buy it at Wally World, really in-expensive. $2.87 a bottle with a $1.00 off coupon attached to the bottle making it $1.87 and tax. Spray on, let it set, scrub with a brush or I used a
3M "scruffy" pad. Rinse or spray with water. Worked wonders on my '71 4x4 frame. Doesn't harm the paint, used it on my fan shroud, valve covers, and many other items. Saves using the solvent tank for other bigger items. Give it a shot, I'm sold on it.