i have recently purchased my first home and found that under the carpet is hardwood flooring. in the foyer a past owner glued parquet flooring on top of the hardwoods. i dont know exactly what type of glue it is or how old it is, but the glue has dryed white and is kind of foamy. is there anyway to get the glue off the hardwood without damaging them? am i going to have to sand it off? any help would be greatly appreciated.