Cobra sent me an e-mail with the "Easy-Off oven cleaner" solution for cleaning melted stuff on pipes. A friend of mine has a Warrior and tried all kinds of things to get the boot marks off... I told him about the Easy-off and it worked great for him.UofM-Fanatic said:Easy-off oven cleaner works great also. Get the exhaust hot, then spray on the cleaner and let dry and then wipe off. Just be careful not to get the cleaner on any painted surfaces. I've used easy-off to remove boot marks and denim burns off my exhausts. Sounds kinda corny ... but it works! An old biker friend that I used to ride w/ in AZ passed on this knowledge to me.