I have a room with an old concrete floor. We used a carbit buffer to remove glue. You can't feel it. I had a concrete guy lay some vinyl cement in some low areas. It looked good but then it did not bond to existing concrete. He has removed what he poured and dosn't want to risk material & time to try again. So I am also concerned about the paint or stain adhearing. Any cleaning suggestions that arn't crazy involved. This is rental property can't spend a lot of $.