For cleaning/polishing your exhaust and the paint around it!
 

I recently went to a car show at the Washington Convention Center, I picked up some absolutely amazing car chemicals:

Liquid Lustre: this stuff took off all of the crap that was inside the paint, it even can take off enamel spray paint, so for all of you w/ straight pipes, and your running a bit rich, this will take off all of the soot/carbon build up off your bumper.

Master Formula Metal Gloss: this stuff polished the bottom of soda cans w/ ease, it looked like chrome, it takes off rust off your exhaust, and polishes it like new, I got mine w/ this high temp sealant, so rain just sheets off of it.

check this stuff out at www.metalgloss.com

for liquid lustre, you can call em at 1-866-458-7873