A layer of dust and dust mites in a hairbrush is not good for your hair or your scalp, as every time you use it you will transfer any build-up directly to your head. A couple of simple steps to rid your brush of this build-up are as follows; remove the hair from your brush, dip and shake the brush off in a bowl of warm water and finally rinse and dry under cold water. For stubborn build-up, we recommend using a toothbrush and a little shampoo before the rinsing step.