MINERAL SPIRITS
Here's a soak in mineral spirits in a cup sized container with a couple holes drilled in the lid; so vapors don't build up. I'm also storing it outside. I don't have high hopes for this, but I could use some mineral spirits anyways. Here's 5 coins to be thrown to the slaughter. These coins have soaked in distilled water for a few days, so the easy dirt has already been removed.
Patina still seems to be safe after 24 hours, and some dirt as well as encrustation have been removed. Throwing them back in fresh spirits for another day or so.

Here's a scan after another 36 hours or so... about 60 hours total.

 

I don't know what happened to these coins or the scan, but the chage was minimal at best, and most likely was bad.

 

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