STP carburetor and injector cleaner fights deposit buildup and helps keep fuel injectors and carburetors clean. Without cleaning, deposits can lead to hard starts, lost acceleration, and rough idling. Specifically formulated to maintain clean performance of fuel injectors and carburetors by helping prevent accumulation of deposits. It's made from jet fuel, a high-quality carrier of active ingredients. Safe for all gasoline engines. Use regularly when you fill up.