510145-004 Industrial Battery Cleaner (4 Pack 32 oz Bottles) - This color changing battery cleaner and acid neutralizer will show you if acid is present (it will be bright red), as it neutralizes the acid the color will begin to change (color will start to fade) and finally it the color will be yellow notifying you that the acid has been neutralized and it is safe to handle. Many refill sizes available. (Includes One Sprayer)