I came across this "recipe" at a blog I occasionally read, Down to Earth.
CLEANING SILVERDid you notice the Australian spelling of "aluminum"?
This method works by a chemical reaction of the aluminium, salt and bicarb soda. Put the plug in the kitchen sink. Lay a piece of aluminium foil on the base of the sink and add your silverware. Pour in enough boiling water to cover the silver. Add one teaspoon of bicarb soda and one teaspoon of salt to the water. Let it sit for about ten minutes. The tarnish will disappear without you touching it.
I tried it last night. I had six really old and badly tarnished serving pieces that I put in the sink on a piece of foil, and added the boiling water, salt and baking soda. After soaking in the sink for ten minutes, my silver was ........ still tarnished, but better than it had been. I added more boiling water to heat it up again and let it set for another ten minutes. This time .... they were still tarnished, but I could see a noticeable difference in a couple of the pieces. I had nothing to lose, so I let it set longer, a total of an hour since I first put them in the sink .... This time I took out the three pieces that now looked pretty good, and left the other three to soak awhile longer.
After an additional half hour, I gave up and took the three pieces out. I dried them with a kitchen towel, and a good deal of the tarnish came off on the towel. I hope that will come out in the laundry. Those three look a lot better now than they did before I started. I wish I'd had more patience though; I'll have to try it again another day to see if the rest will come off.
MY REVIEW - it works, but the more tarnish there is on your items, the longer it takes.