Question: How to clean built-up tarnish on a brass jewelry?

  Options: 
 A. Use a sandpaper to remove major built-up. Then, mix 1⁄2 cup of lemon with 1 tablespoon of salt and stir until the salt is dissolved. Then, add about 2 tablespoon of flour to make a thick paste. Rub the paste onto the jewelry and let it dry for about two days, then rinse it thoroughly using cold water and dry it with clean cloth.
 B. Mix 1⁄2 cup of lemon with 1 tablespoon of salt and stir until the salt is dissolved. Then, add about 2 tablespoon of flour to make a thick paste. Rub the paste onto the jewelry and let it dry for about two days, then rinse it thoroughly using cold water and dry it with clean cloth.
Answer: B