I had some over-spray on my truck from painting the front frame on my 5th wheel. Didn't notice the over-spray was landing on the truck. It made it look dirty all the time (tan over-spray on black truck). I left it on for too long and couldn't get it off for anything.
Got the Miquiar's kit. It comes with the clay, detailing spray (to use with the clay) and a small bottle of wax.
It worked GREAT and removed every bit of overspray.
Also left my trucks finish looking good.
Just thought I would share...

 

BTW I am trying to get the outside of my truck nice in anticipation of going to the all truck show at Carlisle PA next week. I have to agree with other posts here that Simple Green is an outstanding way to clean all the vinyl on the outside of the truck. I didn't use any peanut butter but the simple green by itself did a fine job.

 

WLF-
I agree with you, I have used the Mother's clay bar system and it is a wonderful product. It took the overspray right off of the wife's van. Left the paint very smooth and shiney. I would recommend this product to anyone.