The wood here in Styria is as pure as the water and the people who populate these parts. We don't brush our boards to actually clean them. We brush them to emphasise the wood's beautiful grain patterns. And to harden the boards: brushing removes the soft components from the wood. It is as in real life: only the tough make the grade. After this treatment the boards look even more like wood than beforehand (purely from a visual viewpoint) and have toughened up through the brushing process. Clean deal!
The soft components in the wood are removed using brushes of different strengths. This process not only emphasises the wood's structure, it also increases its hardiness and durability.