I used a wire wheel on the calipers when I replaced my brakes worked great.
I also painted the caliper high temp epoxy paint, although I sprayed the paint into the cap and brushed it on. Coverage was better and the paint dries real fast so I was less messy and l was able to control how much paint to put on.
98 328is Sport Package M3-Spoiler and Front End,
Turner Motorsports 4 Wheel drilled Rotors.
Axxis Brake Pads, Teflon/Stainless Brake Hoses.
UUC Sachs Stage 4 Suspension.
Sway Bavarian Sway Bars.
H&H MotorSports Front and Rear Strut braces.
Conforti CAI and Shark Injector.
UUC System U DTM Exhaust
UUC Short shifter , Tranny Mounts and Clutch Stop.
F1Danza Lightweight Flywheel with M-3 Heavy duty clutch.
Factory BMW M3 Front Bumper with Splitter.
More to follow...MUCH MORE !