I have a 2001 Ford Windstar. When I went to clean the battery terminals: the one with the RED cover over it was a bright blue color; the other had normal white corrosion. I do not know why the this corrosion problem would show different colors.
BTW, my car is not running at the moment, which prompted me to check battery, clean terminals, and make sure the problem is not the battery. At this point we are thinking it is the fuel pump, even though I put in a new fuel pump in March of 2011. If I would ask you to help me with this problem, is there a charge, or "how does this work?"