I cleaned my exhaust tips for the first time since I got her at the end of September(I know, I'm a terrible person). Used some simple green(which has the pleasant aroma of Jager), steel wool, and NEVR-DULL. Did not see as drastic of results as I had hope on the inside of the tips, but they look 100% better from a distance(which is good enough for me because I'm probably the only one who will stare at them from 2feet away).
Before:
After: