The best way to clean the leather is to use water. Yes you can use soup as well but in little quantity. It is better to take a damp cloth and just rub the soup on the cloth and then move that cloth on the leather. After cleaning the necklace place it under the sunlight to dry it out without damaging it. You can also use a little hot white vinegar and after that rinse it with soapy water.
Best of luck buddy.
Best of luck buddy.
