There are a few simple methods for cleaning jewellery, depending on the type of jewellery and the materials it is made of:
For gold and silver jewellery: Soak the jewellery in warm water mixed with a few drops of dish soap for a few minutes. Then, gently scrub it with a soft-bristled toothbrush. Finally, rinse it off with warm water and dry it with a soft cloth.
For pearls: Avoid soaking pearls in water, as it can damage the silk thread that holds them together. Instead, wipe them down with a soft, damp cloth and dry them with a soft, dry cloth.
For gemstones: Clean gemstones with a solution of warm water and dish soap, and gently scrub them with a soft-bristled toothbrush. Avoid using ultrasonic cleaners, as they can damage some types of gemstones.
For costume jewellery: Clean costume jewellery with a damp cloth, taking care not to get the cloth too wet. Avoid using chemicals, as they can damage the metal and other materials used in costume jewellery.
Remember, some jewellery materials may require special care, so it's advised to consult a jewellery professional if you're unsure about how to clean a particular piece.