By "store bought stuff" we
By "store bought stuff" we assume you mean chemicals. Brass can be cleaned using ketchup. Rub a small amount over brass using a soft rag and then wash and rinse the it. For silver, line the bottom of non-aluminum dish with a sheet of aluminum foil. In the dish, mix 1 tablespoon of baking soda with a quart of hot water. Soak the silver item for a half hour (the time may vary depending on degree of tarnish). Buff with clean, dry cloth.