Thanks to its coloring, copper has enjoyed increasing popularity in the kitchen for range hoods, counter tops and sinks, and inclusion in country-style kitchens as an alternative to stainless steel. However, copper does tarnish and requires regular cleaning and polishing. All range hoods gather grease from cooking oils, which attracts dust and dirt. The combination makes your copper range hood a maintenance challenge, especially if you don't like the natural patina the metal develops.
Mix together equal parts white vinegar and water. Dip a nonabrasive scrubbing pad into the mixture, and scrub the range hood to remove all traces of dirt, dust and grease. Wipe the range hood dry with a clean rag.
Add flour to the vinegar and water mixture a little at a time to form a paste. Apply the mixture to the range hood with a clean rag. Scrub until all discoloration has been removed. Use the scrubbing pad if necessary.
Pour about 1/4 cup of lemon juice into a bowl and mix in table salt to form a paste for more stubborn stains or tarnish. Apply the mixture to any remaining tarnish or discoloration.
Apply beeswax or carnauba wax to a clean rag. Rub the wax evenly over the range hood and buff with another clean rag. The wax will protect the copper and it only needs to be applied every few months.