It is not necessary to wash Pure Boar Bristles, because they don’t
take dirt like regular synthetic bristles. Just remove the hair from
the bristles, and the hairbrush is ready to use again.
If you feel more comfortable, you could rinse the hairbrush under lukewarm water.
Hairbrushes made out of wood, should not be soaked in water. This
will cause the wood to swell, and the protective lacquer will crack.