I actually power washed my truck last night. My new 3000 psi washer takes most of the soot off, and what doesn't come off I just run my hand over and it dissappears. I did find that 3000 psi takes the black verticle strip off between the tow windows on each side. It comes off in big flakes but leaves behind a nasty sticky residue. Looks different, I kinda like it. I guess I'll have to pull out the ol' simple green. I use it on everything too. Especially the tractor.