Deposits of magensium carbonate (chalk), sweat and rubber abrasion on the climbing holds (polyurethane, polyethylene) deteriorate the grip when climbing and suggest a worn impression. In successful climbing and bouldering halls, the holds must therefore be regularly dismantled and cleaned. However, cleaning by hand brush, in the dishwasher or with a high-pressure cleaner has so far been less suitable and particularly time-consuming. With ultrasonic cleaning, the dirt particles can be removed from the pores of the surface thoroughly and quickly. The handles are cleaned for 5-10 minutes in the ultrasonic device. Depending on the size of the handles and the choice of device, 10-15 handles can be cleaned at the same time. After the intensive ultrasonic cleaning, the climbing holds regain their original grip.