My husband and I purchased an older home, built in the late 20's which was originally owned by his grandparents. We knew there was hard wood floors beneath the carpet so we decided to refinish them. Upon pulling up the first layer we discovered another commercial grade carpet which had been glued down. It was a job getting the old carpet backing up and now we have to remove the glue. What is the best method/product for do-it-yourselfers like us?