Trim Discoloration

[bubbaG80Sport]

I'm an OCD schmuck and have done TCC's (the pro stuff from pro installers) AND PPF on all my vehicles in the last 15 years...
I used to detail my cars myself, it was very cathartic.
Can't do it anymore...

But your description of the trim, related to TCC is a bit scary.
I wonder now if it's actually oxidation, or some other process.
Oxidation requires oxygen which means the TCC would have pores...
And if the TCC has pores, it would offer little to no protection....
Things that make you go F--K.

My use of term oxidation was misleading. I can only speculate on what is causing the discoloration (ultra violet Light, oxidation, neighborhood dog urinating on my trim at night). My understanding is true ceramic coating (TCC) does completely seal the surface. This would prevent oxidation (i.e. rusting). I was unwilling to spend +$100USD on the TCC. I still find car detailing cathartic.

 

[G-633528]

I’m not sure what they used, but my dealership polished all my trim pieces when I took it in for service. So there must be something that works to clean those stubborn things

I used the Chemical Guys Spot Remover (orange gel) and it worked great! I have a 2018 Sport in Himalayan gray and it took about 3-4 application and some elbow grease (my trim was never replaced so it was built up and way passed warranty) but this stuff works, very satisfying to see those spots disappear!!