The E404 Battery Cleaner and Acid Detector features a specialized foaming agent which turns pink upon contact with battery acid. It instantly neutralizes, dissolves, and removes battery corrosion from battery terminals, cables, hold-downs, battery boxes and more. It is formulated to assure maximum current flow and reduce potential voltage leakage. Comes packaged in a 12.25-ounce aerosol can. Instantly neutralizes, dissolves and removes battery corrosion. Changes color upon contact with acid. Ideal for battery terminals, cables, hold-downs and boxes. Restores maximum current flow and reduces potential voltage leakage. Packaged in a 12.25-ounce aerosol can.