STP Water Remover is a concentrated 2 in 1 fuel treatment. The dual action formula will; No. 1: Remove water from the fuel system to fight gas line freeze, hesitation and rough idling. No. 2: Clean the fuel system to unclog fuel injectors, clean carburetors and reduce intake valve deposits. Use year round. Fall/Winter: Fights gas line freeze and clean the fuel system. Spring/Summer: Remove condensation and clean the fuel system. STP Water Remover contains no corrosive alcohol. Safe for use with oxygenated fuels.