Mix 1 tsp. salt and 1/2 cup distilled white vinegar in a bowl or cup.
Pour in a spoonful of flour and stir with a spoon to make a paste. Keep adding flour until you have a thick, creamy paste.
Scoop up a dollop of the homemade paste with a dust cloth, and wipe the paste over the brass surface. Cover the whole surface with a thin layer of paste.
Allow the paste to work for 10 minutes, at which time it will begin to dry.
Rinse out the dust cloth with fresh warm water, wring the cloth out, and wipe over the brass. Repeat until all of the paste is removed from the brass.
Wipe the brass surface dry with a clean dust cloth to pull out the natural brass shine.