Can i throw in my

here.
I find the white eraser works better than the pink ... plus it is also available in a "pen" form, so it's easy to get into tight place.
It looks like this, and you can find them in office supplies, and in school supply departments ... cheap too
View attachment 602923
Then I finish off with NO-OX-ID (on a Q-tip), which is an electrical lubricant that prevents the formation of oxides, sulfides and other corrosion deposits.
Not gritty, or sandy .. very "clean" to use.
I've tried all kinds of "suggestions" from others, and these two were the pick of the litter for me. Just thought I would pass it on