Step 4: Shampooing the Brush
Shampoo might be harmful for your hair, but it is great for your boar bristle hairbrush, so do not hesitate in using it. Take the warm water, and pour it in the sink/vessel (make sure that the sink/vessel is clean before you do so). Now, apply some shampoo on the brush. Use your fingers to make sure that the shampoo is applied properly.