Tried p21s gel and brush and still no luck cleaning race pad brake dust from my Stasis BBK caliper. The caliper was powder coated black with red lettering. I just need a safe product to get the crevices of red lettering cleaned after a track event. What product and scrubbing tool do you recommend?
Get some IronX. Its for dissolving iron contaminants off paint / glass so should be safe for your calipers. I've used it on 3 piece wheels safely as well.
Powdercoating is very very durable. You should have no issues using any of the afore mentioned products. I use Zeps, CG wheel cleaner, wheel brighter diluted down.......... no issues.