The use of conventional metallic ball bearings is out of the question due to the use of soap. The lubricant is washed out in the long run, the ball bearings run dry, and this leads to machine downtime. The metallic bearings in particular rely on external lubricants to ensure smooth operation of the system. The problem was to find a bearing for the washing brushes, which worked perfectly despite the constant presence of dirt and alkali to prevent the aforementioned downtime.