Lacquered brass needs only dusting and an occasional washing with luke warm water and mild detergent. Rinse and dry. If the lacquer becomes damaged and tarnish lines begin to show, or if the lacquer is turning dark, it can be removed with acetone or amyl acetate (banana oil). Coated objects can also be stripped with a solution of baking soda and boiling water (1 cup soda to 2 gallons boiling water). Let the article stand in the water until it cools and peel off the lacquer.
Before any polish can work, the metal surface must be free of all lacquer.
I do not recommend lacquering metals. If the article lacquered is touched often and develops a scratch
it will soon tarnish and leave an unbecoming dark line. Exposed to light, in time, lacquer will darken and eventually have to be removed. It's a job to remove!