Brake dust:
Ferrous metal particles produced from the friction of train wheels and rail tracks and brake pad material (semi-metallic, carbon resins, asbestos or ceramics formulations) rubbing against the rotor. The brake material friction as well as metal particles from the rotor or rail tracks disperses tiny particles of black dust, which forms a cohesive bond to the wheels and adheres to localised paint surfaces.
The front wheels are usually more soiled, as this is where most of the vehicle braking effectiveness is.
For badly soiled surfaces use an undiluted citrus-based APC (P21S Total Auto Wash), then use detailerâ€â„¢s clay followed by a gel-type wheel surface cleaner for badly stained surfaces or regular for moderate cleaning (P21S Wheel Cleaner) apply a polymer surface protection to ensure easier future cleaning ZoopSeal or (Klasse All-In-One)
Sequestered metal brake dust, if left for any length of time on the wheels causes galvanic corrosion, which etches the surface and eventually dulls the wheelâ€â„¢s appearance if not removed on a regular basis. To remove brake dust stains use a mildly abrasive cleaner (Izâ„¢ einszett Metal Polish âہ“Chrompflegeâ€Â�, P21S Multi-Surface Finish or Autosol)
Ferrous oxide micro-sized particles when they come into contact with moisture will form rust. Heavy deposits of ferrous oxide will require removal with a decontamination treatment (Finish Kare FK1 1119 / 883 Paint Decontamination System). This will remove the deposits and ensure against rust formation.
Acidic wheel cleaners- should be avoided as these cleaners usually contain a solution of oxalic, phosphoric and hydrochloric acids and they may permanently stain or damage wheel surfaces. The use instructions usually state to spray on and rinse off immediately (also be aware that a very alkaline product can also cause problems)
100% acid free wheel cleaners-these usually contain a mild solution of an alkaline (Ethylene Glycol) and a surfactant, the best known is P21S Wheel Cleaner, a 100% acid free cleaner with a 7.0 pH
JonM