Take the cable off and remove clamp if it is an aftermarket one that has been added on. Put about a teaspoon of sodium bicarbonate in a class of water and soak the cable end with it. You will see it react and remove the corrosion. Then brush it off and rinse it off real good. Do the same to the battery post, being careful not to get the stuff in the battery itself. While you are at it check the battery box and see if it is corroding as well. Same treatment. Then give the reattached connection a light coating of wd-40. It will stop further corrosion.

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