Koch Motorplast MP (500 ml) Polo Another option is by oxalic

Another option is by oxalic acid solutions

Cutting depth at 53°: 1-1/2" (38 mm)

Removes Iron Particles and prevents the spread of iron-related damage & helps to protect your vehicle from paint system failure

The 32-piece 3/8 in

1/8" Drywall Guide Bit (191G69-8)

Koch Motorplast MP (500 ml) Polo Another option is by oxalicSpecial engine conserver Naturally shiny, water displacing conserver for engines, housing parts, rubber hoses andpower units of cars, commercial vehicles, etc., with pleasant fragrance. Treated partsregain their new appearance. The complete drying (no lubricating film) prevents dirtsticking. The power units are protected from corrosion and environmental factors by thepermanently elastic protective film. Suitable for use on dry and wet surfaces.