Abstract: A parking aid generates a signal when a vehicle approaches an obstacle, e.g., a garage wall, on which the parking aid is mounted. The distance of the vehicle to the obstacle, at which the aid will produce the optical and/or acoustical signal, can be adjustable or fixed.

Abstract: The apparatus comprises a base including an air pump with an electrically driven diaphragm and an air outlet tube passing through the wall of the base and projecting above its top surface; a separate container adapted for receiving a cleaning liquid and an object to be cleaned, the bottom of the container being provided with an inwardly projecting air inlet collar, the projecting air outlet tube snugly fitting into the air inlet collar; and a porous air distributor mounted on the air inlet collar within the container to distribute minute air bubbles throughout the entire cleaning space in the container and to prevent leakage of the cleaning liquid when the container is removed from the base. An auxiliary capsule adapted to receive the object to be cleaned is insertable into the container. Devices for regulating the amount of the air supplied to the liquid can be added to the apparatus.