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 that produces moisture. Moisture produced will rinse product from contacted surfaces. Rinsing is required on units that have been removed for repair or do not produce moisture during operation. An excellent product for air conditioners, central cooling systems, and auto air conditioners. For use in hotels/motels, homes, office buildings, air conditioner services, and auto repair services.