How to Treat & Prevent Car Battery Corrosion Problems

Corrosion on battery terminals can reduce the effectiveness of a car battery. There are simple ways to eliminate the white or bluish corrosive fuzz and keep your electrical connections in good working order.

You will need

  • Protective equipment
  • Battery cables
  • Battery terminals
  • Nuts
  • Vice grips
  • Baking soda
  • Toothbrush
  • Rag
  • Grease or petroleum jelly
  • Positive terminal covering
  • Terminal cleaner brush (optional)
  • Cleaner compound (optional)

Step 1 Remove battery cables Remove the battery cables from the battery terminals by loosening the nut on each cable clamp. Use vice grips to remove the battery cables if there is a lot of corrosion on the battery.

Step 2 Apply some baking soda Place some baking soda on the terminal posts. Dip a toothbrush in water and scrub the baking soda into the terminal posts and cable clamps. Dry everything with a clean, disposable, lint-free rag.

Step 3 Add some grease Place some grease or petroleum jelly on the posts, battery cables, and clamps. This will slow down the formation of corrosive deposits.

Step 4 Replace the clamps Replace the positive clamp first, followed by the negative one. Cover the positive terminal with a rubber boot or plastic shield.

Step 5 Check the water level Check the battery’s water level every few months. Refill with distilled water to the bottom of the refill hole as needed. Don’t use tap water, which will corrode the terminals.