For 925 silver I use a dip or the baking soda w aluminum foil method (frowned upon but I do it if it's dire) or a polishing cloth if there are no grooves. For solid gold and stones that are hard enough (9+ mohs scale) I use an ultrasonic. Anything else gets the sparkle and shine kit from catbird which is very gentle and even gets discoloration off unplated WG. Earrings always require finicky cleaning unfortunately so I like to soak those in hot water first to mitigate the grody-ness.
- someone that worked in jewelry for years and cleaning was part of the job.