We offer three different finishes on our jewelry and the cleaning method is a little bit different for each.To clean your lightly oxidized sterling silver jewelry use a gentle soap with water, rinse and pat dry.  To add more shine use a soft cloth or a silver polishing cloth.  The light oxidation is pretty much permanent as long as you don't use silver cleaning paste or dips.If you have the bright finish (no oxidation at all) start with the above soap and water, but if that's not cutting it you can soak the piece in a bath of 1/2 cup white vinegar and 2 tablespoons baking soda for 2-3 hours, then rinse and pat dry.  If your jewelry has heavy tarnish (which usually happens when it has sat unworn for long periods of time) you may need to resort to a silver cleaning paste or solution which can be purchased online or locally.  Our dark oxidized finish is not permanent so it has to be cared for differently and polishing is not recommended.  Try rinsing with just water and then lightly patting dry.  A very gentle soap and water solution can be used, but any rubbing will cause the finish to deteriorate quicker.  Your dark oxidized jewelry's finish will wear away with time and handling, and depending on your body's amount of natural oils, or use of lotions, showering and swimming, it could wear away faster.  I am happy to reoxidize anything purchased from my shop at anytime for free as long as shipping both ways is prepaid.  There are also DIY methods for darkening silver that can be found on You Tube.