CRC HFM cleaner is specifically developed to clean mass air flow sensors. Increases horsepower & improves air/fuel ratio and MPG. Plastic safe-dries in seconds! Perfect for cars that have had “over-oiled” performance filters installed. Over-oiling can cause the HFM to gum up, this is the perfect solution. This item cannot ship air freight or internationally. UPS Ground shipping to the lower 48 US states only.