Horse grooming brushes with natural bristles and fibers will not need to be washed often. Instead, while you groom your horse, use a curry comb to brush off the excess dirt and dust from your brushes about every 4-6 strokes on your horse. Use your fingers in the goat hair brushes instead of the curry comb.
To wash your brushes, add a few drops of horse shampoo in a shallow pan of water. Then swish around your brushes, bristle down, in the water. Let them soak 10-15 minutes. Make sure that the water does not meet the handle of your brushes. Although some of them are lacquered, water can still get in to the wood if immersed. Repeat the same with clean water. Dry your brushes thoroughly before using. Disinfect using sunshine rather than bleach.
For the goat hair brushes, sprinkle a small amount of corn starch on the bristles and use your fingers to gently brush of the excess. Do not wet the goat hair brushes.