Caring for Raw Metal Products Over time, your brass and copper accessories will begin to patina. This is totally normal and can be as beautiful as shiny metal. However, if you do not like the look of the aged patina there are simple steps you can follow to keep your pieces looking their best. Avoid direct contact with water and keep perfume, hair spray and other chemicals off your jewelry. Use a polishing cloth for cleaning your piece or make a thick paste of lemon juice, salt and baking soda and brush it over the entire surface with an old paint brash. Let sit for five minutes. Take a cut lemon and buff the surface with the cut side. Rinse well and pat dry with a soft cloth.