It is a good idea to clean your necklace regularly to keep it looking bright and beautiful. Do not use harsh detergents. Simply mix a little spirit vinegar with lukewarm water in a bowl. Dip the chain in the vinegar mix and remove the tarnish with a soft toothbrush or soft cloth. Remove the jewellery from the bowl. Place it on a dry hand towel (or tea towel) and pat it dry.