Hills Brush Company Wooden Washing Up Brush with 4 replacement heads. That is 5 washing up brushes in one. Simply remove the used head and apply a new one. Bristle is made from the natural Mexican fibre or tampico which is a leaf fibre from a spiny, cactus like plant that grows wild in the semi-desert upland areas of Mexico. Tampico is harvested from the wild plants and is completely biodegradable.