The special foam cleaning agents will shake the spray evenly in air conditioning the evaporator into the surface, if too much, can use wet cloth dirt erased, or use a small amount of water washing.

The water wet medium and oil wet medium were experimented with microcosmic visualization model to analyze foam generation and decay, the images were collected by the image collecting system.

The wet type dust-removing apparatus comprises a venturi tube, a cyclone body, a wet cap, a foam dedusting chamber, a water blocking gate, a water supply system and an inducing draught device.