HOW TO CLEAN BRASS
Ketchup: Squirt some ketchup on a clean cloth and rub over tarnished brass.
Soap or Mild Detergent: If your brass is dusty or dirty rather than tarnished, submerging it in warm soap water and clean with soft cloth could do the trick.
Vinegar, Salt and Flour: These versatile home staples can be combined to make a paste to clean tarnished brass. Dissolve 1 teaspoon of salt into one-half cup of vinegar, and add flour until the mixture becomes a paste. Rub into the brass, leave for about 10 minutes, then rinse with warm water and buff dry.
Lemon Juice: Straight lemon juice can be used to clean brass and bring back shine. After cleaning with lemon juice, wipe with damp cloth and buff dry.