Use a brass cleaning product by applying it in a thin layer over the surface of the brass. Let the cleaning product sit undisturbed, and then wipe it away with a mixture of soap and warm water.
Some brass items are covered with a protective coating that repels tarnish and other damage to the brass itself. These items can generally be cleaned with soap and water, or with a commercial product for removing dust. Brass items that are tarnished require more serious cleaning products. When removing tarnish, let the cleaning product stay on the brass item for about an hour before wiping it off.