A bath for Mr. Bresnahan?

[brob28]

Hey guys, hoping to get some opinions from those who have experience soaking cards. I recently picked this card up from a fellow board member (thank you) and have been itching to give Mr. Bresnahan a bath ever since. I've read many previous threads on soaking cards and have a few questions. If you all would chime in I'd appreciate it. BTW - this would be my first time soaking a card.

1) I've read recommendations of soaking times from about an hour up to 24 hours! With such a big difference I'm not real sure how to determine this. Can I assume the length of time depends on how much grime has built up on the card or how cleaned up I hope to get it? That would make sense to me but just thought I'd ask. With a longer soak are there tell tale signs that I'm getting into trouble?

2) Should I be concerned with the edges, they are pretty frayed/worn as you can see. Maybe with this much wear this is a bad candidate?

3) Do you think this card would clean up well or from your experience is the discolor and grime there to stay?

Scans are below. Any and all opinions would be appreciated. Thanks in advance.

Bill