Check out Meguires site for info on clay bars. Basically.....it's well...a bar of clay. You smear it on the vehicle and then peel it off. It removes all sorts of grit and deposits that washing won't clean. It's amazing, you can wash and dry your vehicle and it looks clean as a whistle. Or so you think. Then you clay it and go, "Holy cow, all that crap was in my piant???" You really only need to do it maybe once a year or so.

try this link to their clay bar
http://www.meguiars.com/product_showroom/showproducts_template.cfm?SrcLine=CP&SrcCat=2

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01 SE 4x4
Silver Ice