Removes soils on refrigeration coils & fins. AC Service, Auto Repair, Hotels, Motels, Homes. A must for every professional refrigeration service system.An easy, safe, and convenient. A must if you have a lot of split AC systems. COBRA is formulated to penetrate airconditioner coils and fins to remove all types of soils. Upon contact with the surface of the coil, Cobra begins to react and flush soil to the surface. It is not necessary to rinse if applied in place to a functional unit. Moisture produced will rinse product from contacted surfaces. Rinsing is required on units that have been removed for repair or cleaning.