I recently pulled up some very old carpet in my recently purchased old home and discovered even older vinyl between the carpet and original hardwood floors. As I pulled the vinyl up, much of the white backing separated from the top layer of vinyl and is stuck to the floor. I was able to get about half of it up with a putty knife, but the rest is positively glued down. Is there any trick to loosening this stuff well enough to pull it up? I have tried sanding it, and while it works OK it is very time-consuming and is eating up the sanding belts in record time.