It's worth quite a bit more money in the Paramount holder, which adds a rather substantial premium to what would otherwise be an ordinary coin. Cracking it out would probably reduce the value by half or more just in and of itself. The Paramount blue/black and red holders are becoming scarcer by the day -- a large number of non-Redfield coins were cracked out and melted down during the Hunt Brothers era. The green holders are already incredibly rare and have been for ages.
Those are likely stains on the coin, not dirt, and acetone may not help much. If you do crack it out and it does conserve nicely, then you still have a common date Peace dollar
which will almost certainly be worth less than it was before you started the process; and if your goal is to find a coin for an album, you can find much better examples that aren't in holders.
Of course, it's your coin, not mine, so I'm just offering an alternative point of view.
Longhorn Coins & Exonumia
- EAC - TNA - SSDC - CCT #890
"Most of the things worth doing in the world had been declared impossible before they were done." -- Louis D. Brandeis