An accessory for an aerosol container intended for use in an inverted attitude comprises a cradle to support the container and a lever and cam actuating mechanism to effect opening of the aerosol valve. The cradle comprises two clips detachably fitted to a pistol-type hand grip. The actuating mechanism comprises a double-armed trigger and a pivotable double-armed toggle in engagement therewith. Squeezing of the trigger causes a thrust surface or surfaces of the toggle to press against the nozzle of the container and open the valve.