I have had a similar issue. Faint marks that I can only see in certain angles when in daylight. Mine has supagard on it which I must say is generally great and makes car much easier to clean. I took back to dealer and showed them, they think it's marks due to the supagard application and are going to take it in and sort it out + reapply the supagard.
MY2016 Coupe V6S in Italian Racing Red + Black pack, Black 20" Cyclones, black badges all round. VelocityAP valved Exhaust, black tips. Pano Roof, Sports seats, Cold Climate & Parking packs. InControl nav, Blackvue front + Rear dashcams.
Mine (with whatever coating they added at dealer) spots up v easily in the rain, but they come off with a normal wash. The bird poo (recent sea side trip) on the other hand seems to make a permanent mark within hours....
Tried this out on a small patch of glass and body work tonight and it worked a treat!
Will definitely do the whole car this weekend. Thanks Tel + others!
MY2016 Coupe V6S in Italian Racing Red + Black pack, Black 20" Cyclones, black badges all round. VelocityAP valved Exhaust, black tips. Pano Roof, Sports seats, Cold Climate & Parking packs. InControl nav, Blackvue front + Rear dashcams.