Adhesive removal from drywall
Oi! It aint coming off easy.
You'll have to avoid getting the drywall really wet - so soaking with a solvent might be out of the question - and a waste of time.
Are you planning on painting the walls? Are you covering the walls some other way?
If you're going to paint the walls then I'd suggest to scrape it off with a blade or putty-knife of some type, then apply drywall mud and/or tape and give it a nice professional mud/sand/mud treatment before finishing with primer/paint.
At this present moment in time I am making cabinets for the kitchen - just in case you wanted to know what I'm doing when I'm not around.