However, healthy household appliances, such as Haier's dust-free washing machine, have subverted the design of the outer barrel and eliminated the problem of stain residue in the inner barrel from the root. Aiming at the pollution problem of the evaporator inside the air conditioner, Haier air conditioner is equipped with patented self-cleaning technology, which iterates the industry's first "air-clean integration" clean air conditioner and the clean air conditioner that effectively removes formaldehyde.