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Thank you - the glue is quite dried out so will hopefully come off pretty easily.
Anyone tried this? https://www.sneakerscience.co.uk/products/sneakerser-sole-bonder-sneaker-restoration-transplant-glue
Or should I be looking for something more industrial?
You’ll be wanting a Dremel or similar rotary tool with a flappy sander attachment and a load of acetone and cotton wool . If the glue has totally dried out it will just flake off but if there is any life in it then sanding will just heat it up and turn it back to a liquid and you end up clogging the sandpaper. Then you have to hit it with the acetone and cotton wool for hours.
The glue I used to attach upper to sole was a urethane based impact adhesive which you apply to upper and sole unit to dry out and then heat both with a heat gun so the glue is tacky again then you pretty much get one shot at lining them up before it sets. Not easy to find either.