Scrape as much of the hardened adhesive from the concrete, using the putty knife or floor scraper. Hit large hardened areas of glue with the handle of the putty knife or pry bar to break them into smaller pieces to scrape free. Remove loosened pieces from the concrete with a wet rag.
Saturate the remaining stuck pieces with a soy-based adhesive remover. Wet a rag with the remover and place it over the pieces on the concrete. The rag keeps the adhesive remover from evaporating, allowing it time to loosen the glue from the concrete. Wait 20 minutes before removing the rag.
Scrape the remaining glue from the concrete, using the floor scraper or putty knife. If pieces remain steadfast, apply more remover to the glue and wait another 15 minutes before scraping.
Fill a gallon bucket with warm water and 2 tbsp. of liquid dish soap. Pour the soapy water over affected areas of concrete and scrub with a shop broom.
Rinse soap from the concrete with the garden hose.