This is a question that I am often asked. The answer is very simple and I use it myself in the workshop. Goddard’s ‘Silver Dip’ or any other liquid (dip) silver cleaner.They all do pretty much the same job.
To demonstrate the cleaning result I have included images of an earring which I left out in the workshop for about a year. As you can see it was very tarnished.
Place the earring in the ‘Silver Dip’ for a couple of seconds. The tarnish will begin to disappear immediately. Take it out and rinse it for a while under running water to remove any residue of the ‘Silver Dip’ dab earring dry with paper towel or use a hairdryer. That’s it! You should now have a clean earring without any of the black applied oxidation removed.