There are a couple sources for rust to deposit on the hatch. One is that driving on roads in the snow-belt regions; metal particles from the abrasion of truck's snow plow blades, tends to end up on the rear of vehicles with flat back surfaces because of the air turbulence. Another source of metal particles adhering to our vehicles and causing rust, is residue from the deterioration and wear of brake rotors. One other source of rust deposits, usually on a vehicle that has been transported by rail is rail dust: Deposits caused by wear of rail car wheels against the track surfaces. A paint cleaner product, or clay system will help remove these contaminants.
