hi all, i went to 'a wheel shop' 2 days ago, they angle grinded some of the excess metal from my front calipers to get more clearance for some rims. it was derizzly rain on the way home and dark, i saw in the morning the metal dust from the grinding was all over the front wings and as it was dust it had turned to rust. i washed the car but i can still feel a gritty residue on the wings,how can i get rid of it? i'm a little worried about polishing it as i fear it will lift off ,get caught in the cloth and turn the cloth into sand paper any thoughts? cheers adam