You're most likely are going to have to refinish the floor anyways. This means, the floor will have a heavy-duty sander put upon it. This should take care of any remaining glue.
In the meantime, contact PeelAway.com to see if there's something there you can use. It's a safe product and recommended a lot on this forum. I can't speak from experience as far as it's concerned but you have nothing to lose. I think you can e-mail and call them to talk to them.
My best to ya and hope this helps.
Jay J -Moderator
PS: Like I mentioned, you MAY have to refinish the floor. PeelAway is a 'safe' product and may to more than you want in terms of 'minimizing' what else you have to do to the floor once the glue is removed ...