Scratches accumulate over time the same way dirt does.

Product: Need for Speed Heat
Platform:Origin
Summarize your bug Dirt and grime appears on the car's sides very quickly. The surface being driven on makes no difference (vehicle gets dirty at the same rate whether driving on dirt or roads). Dirt will not be removed upon entering events or repairing at a gas station, and it cannot be hidden in photo mode. Switching vehicles at an event or returning to the garage are the only ways to reset the car.
What car were you using? Ford Mustang '65, VW Beetle, Ferrari Testarossa, Volvo 242DL, Mercury Cougar (at this point, I am assuming any vehicle will be affected)
Was the car your own build or downloaded from the in-game community? Personal Build
What was the last event you played? Free roam and race events
Was it a day or a night event? Day Event
How often does the bug occur? Every time (100%)
Steps: How can we find the bug ourselves? Drive anywhere, in any game mode
What happens when the bug occurs? Dirt textures fade in on the car's sides and windshield as you travel.
What do you expect to see? The vehicle should not accrue dirt when driving on pavement, and instead only become dirty whilst driving off-road. Driving through a gas station should clean the car alongside repairs (like in Payback). Preferably, starting events should also see the car cleaned. Photo mode should have an option to hide dirt.

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I cannot imagine that it was intentional to have cars become incredibly muddy when driving entirely on roads and pavement, especially at such a quick rate. The lovely cinematic loading screens that take place before a race event are tarnished by the filthiness of the car, and it is annoying to start the race like so when all the other vehicles are squeaky clean.

Yep same thing is happening to me and it's worse cause it's not like we can drive to gas station to get the scratches fixed

The gas station won't even repair them which imo is just stupid

I come out the garage to drive to a race that's down the block n I'll be doing 25mph to get there and once I arrive n start the race my car is completely covered with scratches

This has to be fixed

What you are seeing are not scratches. It is rubber debris from your tires, which occurs in real life on race cars due to the hard driving. You've heard the expression "burning rubber?"... What you are seeing is the literal appearance of burning rubber sticking to the sides of the car... It's a realistic look and is not a bug, and it's an awesome addition to the details of the game. 

Its not a Addition it looks horrible. And the car looks dirty as hell after a couple of meters. Although you couldn't fix it at the gas station. For me as a "stance guy" and photographer it's horrible to see this dirt on my car. When I want real dirt on my car then I play WRC or Forza. EA must fix this or make a option to deactivate dirt on cars.

Same. It annoys me that the only way to get rid of dirt is to go back to the garage. Even then, when you leave and drive to the location you want to take a photo at, dirt and scratches have accumulated on your car again. There's a really simple fix to this, just make it so that when you turn off damage in photo mode, it also gets rid of the dirt and scratches. This is how it should have been from the beginning.

Yeah that would be nice. But it would be great when dirt can be deactivate while driving. Because in Videos it looks awful too.

@Jabberwocky79No, it is not "rubber debris from my tires", and even if it was, it shouldn't be appearing ALL OVER MY CAR after two minutes even when I drive carefully at like 25 mph. Please explain to me how "rubber from my tires" is ending up on the middle of my front bumper and on top of my hood, that makes no sense. It's not "realistic" to have your car look like this after a couple minutes of normal driving, or even spirited driving. I drive a 2017 Mustang GT in real life and I drive the hell out of it, never once have I had anything that looks anything remotely like this on it even after a month of not washing it.

I hope EA patches this in the next update I can't see the dirt anymore.