It cleans most air conditioner and refrigeration coils in place, without disassembly. The special blast-spray nozzle allows the product to penetrate deep into the fins of the coil, emulsify dirt, grease and oil deposits, and flush them to the surface. Clinging foam is completely self-rinsing on condensate producing coils. Designed to clean smaller a/c units that can be cleaned without rinsing or taken outside to clean every so often. Several heavy duty "blasts" will sufficiently clean the unit, and allow better air flow to cut down on high energy costs.