Chrome Polish

• One of the best methods is to use a good chrome polish brand like Mother. Apply liberally with a rag, let dry and then buff out to a brilliant shine. You can also use extra-fine steel wool to really polish the chrome and even smooth out minor pitting. Just make sure the steel wool is fine enough that it won't scratch the chrome.
  
  

Vinegar and Foil

• If you don't want to use strong chemicals to refinish your chrome, use white vinegar and aluminum foil. Fold the foil so that it fits in the palm of your hand and dip it in white vinegar. Rub the foil on the chrome wherever it is faded and dull or has residue. Continue re-soaking the foil in the vinegar and rubbing on the chrome until it is clean.
  
  

Cola and Foil

• Another method that may work is using cola soda and aluminum foil. Use the same technique as above by dipping the foil in the cola and then rubbing it on the chrome.
  
  

Other Methods

• You can also use club soda, seltzer water, baking soda or even lemon peel. Use a very fine scouring pad on parts like a car's chrome bumper to remove bugs and debris.