How to remove exhaust dicoloration?

I have a white car and no cat and I have got orange/brown/yellow stains on my rear bumper where my exhaust tips come out. Is there anything made to get rid of this, ive tried soap/water, wheel cleaner, degreaser, lysol toilet bowl cleaner and it gets better, but not completely clean.

You can try 3m rubbing compound then go over that with some 3m swirl remover and wax the comp. shuld get it off but will put some small light schraches in the paint but the swirl remover will get them out nice and smooth just put some on a cotton cloth and work it in, it worked great for my freinds car hope this helps and good luck:)

It sounds like a rubbing compound is what you're going to need. I've used 3M products in the past, their swirl remover works well for things like this.

Have you tried the claybar yet?