Mix 4 tablespoons baking soda with 2 quarts water in a large pan. Place the brass item in the pan so it is completely submerged if possible. Treat large items by turning them during the heating process that follows.
Heat the baking soda mixture to boiling on medium-high heat. Boil the brass fixture for 15 minutes, or until the lacquer begins to peel away.
Drain the liquid carefully and remove the hot fixture with tongs. Dry it with a clean towel and rub any remaining spots with nail polish remover applied to a soft cloth.
Pour a small amount of brass stripper in a shallow bowl. Apply the stripper to the fixture with a paintbrush or roller. Use a small paintbrush to get in crevices.
Allow the stripper to remain on the brass fixture according to the manufacturer's directions. Rub the fixture gently with a clean cloth to remove the stripper.
Repeat the process as necessary until all the lacquer is gone.