The best (and most thorough) method for cleaning your tools requires only water and either a gentle soap (regular soap formulas can dry out the brush's bristles, especially if they are made of natural hair) or brush cleanser. As for natural goat hair.I recommend using equal parts olive oil mixed with baby shampoo and using baby conditioner after) Also do not rinse them with the water going in the barrel or it'll ruin your brushes fast .
Steps to clean the natural bristle brushes 1.Wet the bristles with warm water. (below 40℃) 2.Place a drop of makeup brush cleanser 3.Gently massage the tips of the bristles in your palm. 4.Rinse the bristles. 5.Squeeze out the excess moisture with a clean towel. 6.Reshape and let it dry upside down 7.Please avoid touching the water directly with the wooden handle during the whole cleaning.