Sentinel Formula 922 Urethane Adhesive Remover, 1 Gallon

This is the only remover I've found to remove hard urethane adhesive. But it will not work on thick coatings as it will not penetrate beyond a few millimeters even when completely soaked. If you can get the adhesive down to a thin layer then this will cause the adhesive to bubble off the concrete to easily scrape up.

If you're looking for a product to remove urethane adhesive. This is the product that you have to purchase. Buy a cheap pump up sprayer. Spray a good coat on the adhesive let it sit for about 30 minutes and then it scrapes up like a hot knife through a butter.