I would like to ask a few questions about the poles of a car battery 1) If the battery terminals turn greyishly black, then this is corrosion, which results in higher resistance and therefore worse starting? The surface has formed between the round terminals and the battery poles. It is not crystals, as one can find of corroded batteries on photos in the net, only such a dark surface. If one cleans this surface away and the battery again on the round terminals h 2) I cleaned the battery pole and round terminal inside as follows: * wiped off with brake cleaner on toilet paper * clean clean with steel wool * sprayed with contact 60 and wiped off * sprayed with contact WL and wiped off * sprayed with contact 61 and wiped off * glued round terminal onto the battery pole and screwed on * sprayed on battery pole grease (not between round terminal and pole, only from outside) Is this ok? 3) Battery pole spray t not before connecting between pole and terminal, but only after connecting, because probably not electrically conductive? I specifically used the blue can of Caramba. Battery is Exide, normal wet 12V.