Have you tried WD40?

That was the one I missed of my never ending list. Yep, tried that too :-(

Goof off? Goo-be-gone?

Contractor's solvent or the citrus based type works, but can affect the wood finish. I used on vintage oak floors.

Dab on lightly with cotton swab, wait for it to dissolve the residue, scrape off with plastic putty knife. Keep rag wet with a little detergent and wipe immediately. Repeat. It works but you have to be really really patient and careful. Also something called Motsenbacher's, at Ace Hardware. Not sure of spelling. Comes in a little can. Never tried on wood but very fast.

Good luck.

I've had tape residue on my vinyl (or whatever material from the 50s) kitchen counter after leaving really strong mailing tape on it for several days. What I found effective was rubbing it with cooking oil. The oil makes the glue less sticky and you just use some a rag (not paper towel pls) to rub it off. It does no damage to the wood at all. Everything you've tried so far I think is water based, so trying something oil based might work. Adhesives often are oil-based. Good luck!

And just to add to the pain, anything CHEMICAL is going to cause ISSUES with refinishing. Remember: chemical contamination (aka..WD40, Goof Off, Goo Gone, Orange oil, etc) will prevent your floor from taking a finish. Hmmmmm. Not good.

You really should be using a mechanical removal system (aka...low-grit sand paper...palm sander, chisel, etc). If you PHYSICALLY remove the glue (and some of the wood it is sitting on) you will NOT have an issue with refinishing.

Besides, an OIL finish requires EXCEPTIONAL LEVELS of sanding. The very BEST sanding professional you can find = just good enough for oiled floors.

How about a photo so we can see what you've got going on for wood and adhesive.

Mc Carthy is right....try denatured alcohol....but your best bet will be sandpaper....or perhaps a hair dryer to soften it, then scrape with a spatula and finally sandpaper.
But WD40....goo gone, orange oil, goof off all will leave grease behind that will affect the finish you will put on next.

So what I've ended up doing is using a mix of a belt sander, orbital sander, mouse sander and then using a small wire brush gently (as gentle as you can be with a wire brush!) go with the grain as that was ultimately where most of the sticky stuff was. Now, by using the wire brush and alcohol you are being quite brutal but I didn't mind that and what I then did was use the belt sander to sand a few more rough areas into the wood so those areas where the tape were weren't as noticeable.

Finally, I then used the orbital sander with a 150 grit disc so get a nice finish. Spending the forthcoming weekend oiling it with Osmo 3044.

Mineral spirits to get the tape residue and then denatured alcohol to clean off the mineral spirit residue.