Run the bristles under lukewarm water.Dont use hot water,as the heat may damage the bristles.
Pour some baby shampoo to the water. Add 1 tea spoon of baby shampoo into the cup and still gently to combine.
Dip the brush into the mixture and swirl.Only the bottom half of your brushes bristles should be swirled in the mixture to avoid water traveling up the handle.
Rinse the bristles under lukewarm water. Patthe bristles dry, then reshape them.
Let the brush air dry, then fluff it with your fingers.