One of the professional tech's best-kept secrets, this carb cleaner is simply the most powerful and effective in the industry. Containing toluene, this spray is strong enough to get ninety-nine percent of the carburetors clean without major disassembly, and in some cases without even removing them from the vehicle! It's that good. Be careful with it however. It eats nearly everything after prolonged exposure, and it is of course toxic.