Auto body clay!

I think you can get it at Autozone and Pep boys.  The brand I use is clay magic.  http://www.claymagic.net/

You can use water with a little car wash soap as a lubricant if the bar doesn't come with some (or when it runs out). You simply wipe it across the paint and it pulls road tar, over spray, bug guts, tree sap,  rail rust and just about anything else you've picked up off of the paint.  Folding the clay exposes a clean surface and its really amazing stuff.

I used it on my wife's volvo this weekend and removed months of road tar, tree sap, baked on bird dookey and bug juice, etc from the paint.  My only regret?  getting the smaller bar.

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