1. Head down to Bunnings for some TUFFMAN plastic buckets and thick gloves. 2. Chemical bath #1 3. Bath in some green stuff. That's gotta help. 4. Get out the high-pressure hose to clean off the chemicals 5. Blowdry 6. Brillo pad / pot scrubber. Use the rough side with nice long strokes. 7. Might as well buff it a bit too. 8. And finally spray on the secret sauce. All images of the process taken from the following Perth Mint video: [youtube]http://www.youtube.com/watch?v=Lv5p6pVXgBQ[/youtube]
^ Only needs an hour. Tombstone beside a newish bar for comparison. (click image for larger aspect) [imgz=http://forums.silverstackers.com/uploads/14335_ts1.jpg][/imgz] [imgz=http://forums.silverstackers.com/uploads/14335_ts2.jpg][/imgz]
Yep, I've had some interesting results with that method. It's a fun thing to try if you have some misc silver lying around.
I have this YPS skull and 1oz tombstone sitting in its little cardboard coffin for a couple of years and it is starting to show some very nice coppery toning: