Remove the battery from your car and clean the battery with a small amount of white vinegar.

To really clean up the terminals in your car, use your Dremel 8200 with the Stainless Steel Brush 531. Use a maximum of 15.000 RPM.

Then take your Dremel 8200 and Stainless Steel Brush 531 and turn your attention to the terminals on the top of your car battery to improve the contact that they make with the leads in the car.

Replace the battery in your car and connect up the leads to the battery using an ordinary spanner.