Unlacquered brass tarnishes when exposed to air. A weekly wiping with a little liquid ammonia on a soft cloth will help keep unlacquered brass shiny. Experts at the Michigan University researched this subject and their studies resulted in a definitive version of caring for your precious brass items. In simple language, here are some ways to go about it.
Use a commercial cleaner or a homemade cleaner to remove tarnish. On antique brass, test the cleaning product to be sure of obtaining the desired effect. Some methods not only clean tarnish but also remove the mellow coloring of age that is desirable on old drawer pulls and other accessories.
To polish antique brass pieces: wash in hot, soapy water to remove grime, wax, etc. Rinse and dry. Moisten a soft cloth with boiled linseed oil and rub on the brass surface until all the dirt and grease have been removed. Polish with a soft cloth. Very old brass items, especially if in poor condition, require special care, in which case you can consult museum experts for advice.
To polish for a soft finish: wash in hot, soapy water, rinse and dry. Make a paste of whiting and boiled linseed oil. Apply with a soft cloth and rub to remove tarnish. Wipe off excess paste and polish with a clean cloth.
To remove heavy tarnish, difficult stains and corrosion: wash in hot, soapy water or a weak ammonia and water solution and rinse. Dampen a soft cloth in hot vinegar, then dip in table salt and rub the brass, or make a paste of flour, salt and vinegar. You may need several applications. When the item is clean, wash in hot, soapy water, rinse and dry thoroughly, then polish with a cloth moistened with lemon oil. If preferred, dip a slice of fresh lemon into table salt and rub over the corroded area. Wash, rinse and dry carefully.
Brass andirons and fire sets that have been neglected require special treatment. They can be rubbed with extra-fine steel wool; however, this requires much time and work. Very fine emery cloth will give quicker results, but the metal must be rubbed in only one direction, do not use a circular motion. When clean, polish with a brass polish. Some commercial polishes do not require rinsing, so follow label directions.
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