Do the exhaust tips come off? Spent 20 minutes using Never Dull or whatever but it had to effect on the stuff that was really crusted on. Found out that I can remove the exhaust tips, took it to my laundry room, found some metal scrubbing thing used for stainless steel appliances, and it had my exhaust tips looking practically new in 5 minutes.
The metal scrubbing pad I'm referring to is this:
http://www.amazon.com/gp/product/B00...1AYNB9W2SC67EQ
not the exact one but yea you should be able to find it anywhere.
OH and be very careful if the exhaust tips cannot be removed while using steel wool or metal scrubbing pads, it will destroy the paint on your car or anything that's plastic or whatever.