I recently closed on my new residence and project, a 1949 cottage that was improved in the early 90's.
My first task was to tear up two layers of linoleum, revealing the nice original oak hardwoods. I'm trying to figure out how best to remove this black tar adhesive and a cardboard like residue sitting on the boards. I'm going to have a professional come in to refinish, but I think I need to get more up before asking them to sand it.
Here's a picture (I have the sellers to thank for the pink broom, they didn't clean their garbage out).