Watch straps get dirty when worn due to dust and sweat that sticks to the surface. Grease and dust can accumulate especially in the fine spaces between the chain links. With ultrasonic cleaning, even the finest gaps can be thoroughly cleaned and the original shine of the objects can unfold again. The watch case must not be cleaned in the active ultrasonic bath, even if it is declared water-resistant. Due to the intensive cleaning effect of ultrasound, moisture can in some cases also overcome the seal of waterproof watches.