[header] How to clean battery connections [title] Wear protective gear. [step] Find a pair of nitrile gloves (medical grade), goggles, and a mask for your safety. The batteries contain acid which can cause severe damage, so make sure you keep your face and hands covered. 
Once you have your safety equipment in place, move on to the next step. [substeps] If you get any of the chemicals on your skin, clean it off with soap and water.