My Ford 350 diesel has a big time problem with battery corrsion on the terminals. I have tried the corrison preventive spray, WD40, Fluid flim, Dielectric Grease. Nothing stops it. Batteries are original and in great shape. The wire connectors that go on the terminal are starting to degrade. I need to know if there is a way to stop this. I need to replace the connectors, but I dont want to throw good money after bad. Please help. The batteries are the maintenance type, and I check them monthly. They are not overfilled either. I need to clean my terminals about once a month. I also tried those stupid washer things. Please help. Thanks guys.