I would like to know what kind of stubborn white lining is that is on all sorts of parts on my mopped. I tried to polish it off with kerosene and an electric toothbrush, but that didn’t work. Before I use all sorts of means now, I would like to know what kind of corrosion it is, i.e. which element oxidizes to what, and then possibly with a special remedy to proceed purposefully. elag came within half a year by driving in the rain, probably sometime with salt participation. Half a year ago all these parts looked like factory new.