Rain-X Headlight Restorer 5ozOvertime, plastic headlights become oxidized rendering them hazy and yellow. This causes headlights to shine less brightly, which is dangerous for the driver and others on the road.RainXHeadlight Restorer can help improve drivingvisibility by restoring hazy, yellow headlights back to clear. RainXHeadlight Restorer is best for mild yellowing or haze on headlights while the RainXHeadlight Restoration Kit is recommended for more severely oxidized headlights.