A combination tool – battery post brush and battery clamp brush, obtainable at any auto parts store, or online. These generally come in two designs, one employing wire brush elements and the other using two cutting blades and a reamer. Though old pros prefer the latter, either will work and either is suitable if you’re not cleaning battery posts on a daily basis.
Locking pliers (vice grips).
Toothbrush.
Baking soda.
Water.
Clean, lint-free cloth.
Wrench.
Grease or petroleum jelly.