Brushes for working with metal clay, metal sheet, and other custom metal creations: Brass wire and steel wire brushes are excellent for cleaning most types of metals -- they help you remove oxidization, oils, dirt and chemicals from surface areas and crevices. Brass brushes can be used with water. Steel brushes are normally used dry, to prevent rust. Brass is a softer metal, and excessive brushing with a brass brush can transfer some brass to the metal being cleaned. Steel is harder, and is excellent for adding texture to both fired and unfired metal clays.