hi guys, another rookie question heading your way! I've stripped the wallpaper in my living room. 2 walls are relatively recently plastered and I think with a bit of sanding and filling they'll be good to paint so my question is: Do I need to do anything to the walls to get rid of any paste residue and flecks of wallpaper backing, before painting? Would this be a sugar soap job? Also, more of a plastering question but here we go.... 2 walls will be plastered. If there are patches of wallpaper backing still on the wall, can that just be skimmed over? Not sure if you can make it out in the photo but this is what I'm on about. It's not the paper itself, justbthe stubborn bit that didn't come off.