My wife has a C300...It's a 2015 I believe...paint code 755. I washed, then clayed it. The paint is in great shape other than some small scratches on it from being a daily driver, as well as a few water stains, a few small etchings, and some very light scratch/marring type lines probably from improper washing. I did a test area with Wolfgang TSR 3.0 using a LC orange pad and it didn't even hardly do anything. It took a few light swirls out but some of the other marring lines and the scratches/etchings it didn't touch. It's apparently not a ceramic paint. I've got some Griot's Boss Fast correcting cream and a few heavier cutting pads on the way to test. I'm wondering if I should send the Griot's back and get some Menzerna? I did try out a 3" microfiber pad on the small etching spots and it removed them mostly. I can still see a faint trace of them.