Bead blaster concrete surface prep. They can be rented.

To get a perfect stain you may need to sand it down to bare wood. You could use a courser grit or carefully spot-scrape if you want the wood to remain textured. Not knowing your exact floor it is hard to give exact recommendations. Depending on the adhesive you used (Bostiks Best, etc) it is very unlikely anything will wipe it off after it is dried.

We have just installed Hard floors on Concrete using the glue down method. Unfortunately, my husband also got glue on our floor as he was installing. We saw in another chat thread that Mr.Clean Magic eraser works on the dried glue. I had my doubts, but decided to try it anyway. It REALLY works. The Bostik and Mopei cleaner does work too but leaves an oily residue on the floor, which then needs to be cleaned up, I've heard that denatured alcohol works good with this, but have not tried it yet. Has anyone else had experience with that? I've used Magic Eraser, Bostik adhesive remover, Mopei adhesive, and then cleaned with Bruce and Bona cleaner, and so far nothing has hurt my floor! It's hard work but gradually we are getting it all up!

This is the floor. More has been scraped up since photo was taken, but there is still a lot of adhesive left. I am hearing conflicting things about muriatic acid to remove more adhesive. One source says don't do that because it will leave an oily film, not to mention be very dangerous to use inside a house. I am wary of other chemicals, too. We tried grinding, but it filled the entire house with dust within minutes. Any further advice? @SJ McCarthy @Sye Phommachanh Update: We've now tried paint thinner which left a residue that had to be cleaned up with dishwashing soap and water. Now we're set to try Formula 747 Adhesive Remover recommended this morning by the supervisor of the tile crew coming Monday. The adhesive is really stuck, so we're loosening it with still wool after remover has been applied.