Just managed to clean the Rally GB mud from the wheel arches properly as the pressure washer has been poorly.

When I was jet washing them there was a blackish coating that was coming off and the cars colour showed through.

Stop the jet wash as I couldn't tell whether it was caked on dirt or a covering of some sort.

Should the wheel arches be the same colour as the car or have a black film covering?

 

Sounds like you have jet washed your waxoyl off

 

Yep - you've cleaned off the underseal oops!!

(It's not expensive to get a tin and put it back.) I've done it as well...

 

Halfords do a 600ml Can for about 7 quid IIRC

 

**** halfords go to a local motor factor< partco etc > would be about half the price if not more

 

That's some pressure washer!!!

 

mine were never undersealed, nor the rest of the car.

justkeep it all clean & everything should be fine

 

Cheers folks