Just washed my red F-Type and noticed a barely visible lace-like film on the paint surface, obviously from exhaust residue that is pulled into the low pressure area and settles on the rear bumper. It's only visible with the right light. I washed it and it wouldn't come off, tried a quick detail spray with no effect. Then tried wax, absolutely doesn't touch it. Is there something that will remove this discoloration from paint? I can only imagine the chemical concoctions produced by burning today's gasoline and it sure appears to damage paint. Is this the result of "Acid rain"?

 

Have a good detailer look at it, and consider having the surface cQuartzed to protect it from further damage after the issue has been corrected.

 

Can you post a high resolution picture?

 

I have doubts that it's from exhaust residue, but I do agree that whatever is on the road gets sucked into that low-pressure area. It's more likely from something you ran through on a road surface at some point.

 

Totally in agreement here. 13,000 miles on a 2016 R and I have nothing like you mention on mine...

 

+2. Colorado uses a clear road sealant that is sprays on the interstates. I was about 1/4 mile behind one of the spray trucks that was leaking and ended up with that clear gunk all over my '84 Vette. Had to use mineral spirits to remove that cra$.

 

Don't think it's exhaust residue either. And not the place for acid rain spotting, which usually shows up on horizontal surfaces like the hood, roof or trunk area. (Acid rain leaves residual rings or shallow spotting (in its more severe form) from the dried-up rain droplets.)

Your lace-like film could come from any number of road contaminants, but your comment that there is discoloration adds another possible level of concern. Good thing you're attending to the matter promptly. What do you feel when you move your hand over the area? Is it smooth or rough?

A good pic might help or not. Pretty difficult to diagnose with seeing the patient. Washing, detailing and wax are "light-weight" corrections at best. You or your detailer will likely have to go more aggressive to cut/remove the contaminants. Keep us posted.

 

Sounds like a mineral deposit.

 

 

It's very difficult to see much less photograph. I can only see it when the sun is near the horizon behind the car. The low light reflects upward off the bumper and I can see it. Direct light and I don't. The closest thing I've seen is a glass shower door that has not been cleaned for a while. Dried water spots leave a residue that is difficult to remove. The car is garaged and rarely wet however goes long periods without being washed. I even tried "Scratch-off" to no avail.

Thanks for the suggestions, I'll keep trying.

 

Have you tried detailing clay?

 

Is it the entirety of the rear bumper? Does the problem extend to the rear panel or fenders. How soon after the car was munufactured did it get coated or waxed?
A similar thing happened to me with the passenger door on a '70 280SL and the right side headlight cover panel on an '84 Corvette. The paint on those panels wasn't cured properly. Both were covered under warranty. You'd think QC would be better these days, but…

 

Yep, I would try using a clay bar or clay cloth on it.
I have used Dodo Juice clay bars in the past with great results, Bilt Hamber also make a good one.

 

I've never heard of Dodo Juice brand. I use Adams, they make excellent detailing products too.

 

Dodo Juice home page: Dodo Juice - Home of handmade car care.
I love their products, real top quality stuff.
My favourite is Born Slippy, designed as a clay bar lube, but it's a fantastic all-purpose cleaner. I've tried literally dozens of things to clean my computer and TV monitors but this is the only stuff I've ever found which gets them totally smear free and crystal clear.