Works effectively on damaging deposits. Ultra Cleen Professional Air Intake System Cleaner removes harmful deposits that rob an engine of power. The special formula cleans throttle body plates and air passages working effectively against the heavy deposits that build up in today's advanced fuel injection engines. This oxygen sensor and catalytic converter safe formula helps clean the combustion chamber, intake and exhaust valves to help reduce emissions and restore engine performance. Use with Ultra Cleen Kit (CST100CQ) and "S" Tool Adapter.