We sell these - Jewellery Care Products . If your jewellery is heavily scratched, take it to a jeweller who will polish it with tripoli to remove the scratches. Hagerty is a well known and popular brand name. For sterling silver that is heavily tarnished and silver flatware, these polishes are recommended. The polish is rubbed onto the silver, left to dry, then rinsed off or wiped off with a dry soft cloth or tissue.
Some polishes contain a silver anti-tarnishing agent.
Gold does not tarnish like silver, but you won't harm your gold jewellery with a silver polish. It costs more to get one with a heater. An ultrasonic denture cleaner is the same thing, just labeled for a specific purpose. Special Precautions must be used for Gemstones - some gemstones are quite delicate and can be severely damaged in an ultrasonic. If your cleaner does not have a heater, use water from your hot tap.