We just bought our house and we're taking all the wallpaper down (the house was stuck in the 80s). Anyways, someone told us that you have to do something with the glue underneath or your new paint will chip. We scored the wall paper and took it off with that spray and everything came off. But I'm guessing there's still glue there (not sure)?? So what do I need to clean this off so my new paint doesn't chip??? Would a light sanding work or is something more drastic needed??