First let me say don't clean a valuable coin! Ok now that the disclaimer is out of the way. I got this method from a friend on another site. Phil from IN. It works very well! You take that old nickel and soak it in ketchup for a few hours. Put a tooth pick or something else under it so the ketchup will get underneath as well.
After a few hours rinse it off then put some baking sada on it while it is still wet and scrub with a toothbrush. If it is still rusty looking do it again. Here are my before and after results!
[attachment 64291 DSC04537.JPG] [attachment 64292 DSC04539.JPG]
[attachment 64293 DSC04538.JPG] [attachment 64294 DSC04540.JPG]
Here is the cleaned 1910 next to an un-cleaned 1892!
[attachment 64295 DSC04541.JPG] [attachment 64296 DSC04542.JPG]
After a few hours rinse it off then put some baking sada on it while it is still wet and scrub with a toothbrush. If it is still rusty looking do it again. Here are my before and after results!
[attachment 64291 DSC04537.JPG] [attachment 64292 DSC04539.JPG]
[attachment 64293 DSC04538.JPG] [attachment 64294 DSC04540.JPG]
Here is the cleaned 1910 next to an un-cleaned 1892!
[attachment 64295 DSC04541.JPG] [attachment 64296 DSC04542.JPG]