How do you loosen wood clue?

Denatured alcohol should work.

Here are multiple techniques to loosen and remove the glue:

https://startwoodworkingnow.com/how-to-dissolve-wood-glue/

Hi Meredith, use your hairdryer to soften the glue and wipe it away. You can also use vegetable oil. It normally works for me.

The hair dryer method has worked for me as well. Be patient and as the llue softens you can scrape the old away before regluing properly.

Hi Meredith, hope this helps you out, Soak a cotton bud or rag in a solvent such as acetone nail polish remover or vinegar diluted in water. Note that acetone is only suitable for unfinished, untreated wood, while vinegar is a softer alternative, less likely to cause damage.

Here are 7 methods.

*Disclaimer – Some of the chemicals below are corrosive and have fumes. Please ensure you use respirators, gloves, and glasses when applicable

1. Ammonia – Using the same process as vinegar (without the heat) you can dissolve wood glue with the exception of you will blot or dab with the cloth and not wipe. Please note ammonia is corrosive.
2. Vinegar – It is an excellent way to dissolve wood glue. Non-diluted is the best way of using vinegar. The key to it dissolving glue is the acidity of the vinegar. Using a cloth apply to the glue on your wood sign. You don’t need put a lot on and it works.If the glue is really relentless you can heat up the vinegar on the stove and reapply with a cloth. The glue will release.
3. De-Glue Goo – Created by Larry McNeil De-Glue Goo is an excellent choice for removing wood glue. Use a heavy coat on the glue on the wood sign and allow 15 to 30 minutes. Then clean off the excess. This is very clean and easy product to use.
4. Rubbing Alcohol – Most folks have rubbing alcohol around the house. It is an inexpensive products and works very well. Using a cloth put some alcohol on the cloth and slowly rub back and forth until you see the glue start to dissolve. If the glue is relentless place cloth with rubbing alcohol on the glue and let sit for a couple of minutes. It may take a few times to release and loosen the glue but it will work well.
5. Hair Dryer And Water – This is by far the easiest of the the techniques. Place towels around the glue on the wood sign and using a sprayer add to the wood glue. Additionally you can use a wet cloth with water that is not dripping. Place on the wood glue. Using a hair dryer or steam machine direct the heat from the hair dryer while spraying a little as you go. You should be able to get the wood glue to come loose.
6. DeNatural Alcohol – Also known as Methylated Spirits is ethanol with additives. It is very poisonous and smells really bad. However, it works very well on releasing wood glue. The best way to apply is to use a small bottle with a small opening top. You will want to use very little but highly directed to where the glue is. Allow to sit for 5 minutes and start to wiggle the wood glue join. Continue to apply as you wiggle the joint so you don’t crack the wood glue join.
7. Acetone – Also known as Propanone or Nail Polish remover is colorless and very flammable. It also has a lot of fumes which will require you to use a respirator and gloves. If you use Acetone on your wood sign glue joins ensure you use prior to adding stain or finish sealer as it will damage the wood.

Undiluted white vinegar can dissolve wood glue. Apply with a soaked rag.

Acetone, the kind you buy in the hardware store not nail polish remover. You can also try a plastic scraper. I would take the back and use a staple gun next time.

You could also try some very warm water first before hitting the chemicals. Always test anything you plan to try in a hidden spot first to make sure it doesn't damage the piece.

There are 7 options here! https://www.woodworkingbylpicustom.com/7-methods-to-release-loosen-wood-glue-helpful-guide/