According to Hardwood Champ, the two most common adhesives found dried onto hardwood floors can both be removed with a bit of elbow grease, some adhesive removal products or mineral spirits and a putty knife. The process can be time-consuming, depending on the amount of adhesive and floor space, but it requires at least a little over 24 hours for completion.
Identify the type of adhesive
Take a close look at the coloring of the adhesive to determine its type. If the adhesive is yellow or tan, it is likely to be a general carpet adhesive, which requires a commercial adhesive remover. If the adhesive is brown, then it is tar-based and can be removed with the help of mineral spirits.
Increase the ventilation
Open all of the windows to the room to increase the ventilation and speed up the drying process.
Soak the adhesive
Soak a cloth in the proper adhesive remover – that is, commercial remover for general carpet glue and mineral spirits for tar-based adhesive. Place the cloth onto the adhesive spot that needs to be removed and leave it in place as long as is directed by the manufacturer. The remover softens the adhesive, making it easier to remove.
Scrape away the adhesive
Remove the cloth and use a putty knife to scrape away the adhesive carefully. Remove any residue from the adhesive with a rag soaked in the appropriate removal solution. Allow the floor to dry for 24 hours.