Pickups maintaince

My pickups are starting to rust :( need some serious tips here.

My good friend was having that problem so i started to just get a clean rag and wipe off the sweat after each time i played and i havent seen no rust yet

Hmmm sweat I thought about that too, but I dont seem to sweat so much when I play. Well I can understand strings getting rusty because of sweat, but I don't think sweat getting down to the pickups (well ..yet). I was thinking the environment I'm in, has lost of moisture in the air?? (Dont' know if that makes any sense but). Do any of those guitar cleaners work on pickups too???