My hypothesis is this issue is only applicable to the 2018 G80 Sport based on the postings in this thread. If any non 2018 G80 Sport owner has this issue let us know. Additionally, it would be helpful if any
non-U.S. 2018 G80 Sport owners have this issue (e.g. our northern neighbors -eh

. My 2018 G80 Sport was purchased in the East Tennessee. Port of entry was Brunswick, Georgia (U.S. not Russia

) with a manufacture date of April 28, 2017
The 2018 G80 Sports is the only model with the darkened window trim pieces. Per the sales brochure "Sport dark chrome grille surround, grille insert and
window trim".
I suspect this is an issue with the supplier using a "lacquer" to darken the non-Sport trim that is highly susceptible to this discoloration (acid rain, manufacture post lacquering cleaning solution) and not doing proper Q/A on their product before delivering to Genesis/Hyundai. My replacement trim had the same minor pitting on one piece. I assume, but cannot confirm, the dealer ordered replacement trim and did not "borrow" it from another G80 sport on the lot.
Since the replacement, I've done numerous home hand washes, 1 touch-free drive through wash, parked outside/driven in the rain, and the discoloration has not re-occurred. Car is kept garaged at home.
I did not discover this until my first home wash a couple of weeks after delivery. It took me several months to take it back to the dealer. Dealer replaced at no cost/no fuss (Mr. bubbaG80Sport we'll order the parts and fix the issue no problem).
My suggestions are:
1) Keep complaining to dealer
2) Find another dealer
3) Call Genesis/Hyundai repeatedly until you get resolution. Being gracious, charming and courteous will go a long way. As they say “You attract more bees with honey than vinegar”.