I just stumbled onto something. In an attempt to clean my T&Co. 10 year old jewelry, I used a combination of water, salt, & baking soda. I laid the pieces in a glass bowl lined with aluminum foil. Then I poured boiling water over the jewelry, then I added the salt & baking soda. You can actually see the tarnish disappearing. I'm not recommending this, but for impatient people like me who need instant gratification, this concoction definitely did the job.