This product performs four functions: cleans, detects acid, neutralizes acid, and protects against corrosion. The cleaner's foaming action penetrates and emulsifies dirt, grease, and deposits. The foam turns from red to brilliant blue in the presence of acid, and helps bring pH to a safer level. And the product's red film provides a barrier against future corrosion and the elements. Excellent for use on terminals, cables, brackets, and housings. 14 oz can