Horse grooming brushes with natural bristles and fibers will not need to be washed. 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 of use. Use your fingers in the goat hair brushes, not the curry. Be more gentle with mud brushes when cleaning with the curry.
Do not use water directly on the brushes or immerse in water. The wood cannot get wet at all. Instead, use a damp cloth with warm water and gently rub the bristles remove dirt.
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 use water on the
goat hair brushes.
Below are the brushes in my hand. For reference, my hands are small (but not tiny) and I wear a US size 6 1/2 glove. Also, I have used all of the brush sizes from Leistner and have not had any problems with not fitting in my hand.
Hoof Brush w/Handle
Medium Goat Hair
Face Brush (for sizing of the Ultimate Horse Head brush)
Hedgehog Mane & Tail (for sizing of the Woody in Ecru)