To obtain excellent cleaning and rinsing effects on domestic air- conditioner fins while retaining constant lather quality independently of the variation of environment such as the temperature difference between summertime and wintertime.

A domestic air-conditioner fin cleaning agent which comprises an aerosol stock solution containing 0.5-10 wt.% surface active agent 0.5-10 wt.%, alkali component, and 10-30 wt.% lower alcohol and a liquefied petroleum gas as the propellant with a mixing ratio by volume of the aerosol stock solution to the propellant of 85:15 to 60:40 is filled in an aerosol container 13.