Weathering race cars?

[coolingthunder]

So,

 

I am working on a Tamiya Mercedes CLK-GTR, and have gotten the idea in my head to do some weathering to it. Nothing too heavy, just dirty it up a bit like it just drove a stint on the track.

 

I have found plenty of stuff for rally cars, but that is wayyyyyyyyyyy too strong. I just want to dirty the nose with bugs, asphalt and rubber, same goes for the area just behind the wheels (where I would expect to be a buildup of brake dust and rubber bits)

 

Anybody have any good leads I could follow here?

[fewr9fkr9595]

Hi mate, I did a wash on the wheels and airbrushed some grime around the arches for brake dust and dirt etc. 

 

Just on one side though so I could change how it looked in the cabinet 😂