The problem is they drywalled the entire area but stupidly never insulated the ceiling and walls.The drywall is in great shape so I would hate  to rip it out and have to redo it only to put fiberglass insulation in.I could try to take it down but salvage the existing drywall and attempt to reinstall it but even if I could locate and take out all of the screws its probably more effort than it's worth.The other option I have is slow rising spray foam.  

Get someone to spray it - it will look new.

Spray it on the stain, let it work for a minute or so, and then wipe up with paper towels or a rag you don't care about. 

No "smoking gun" that there are bed bugs -- but the spray cans are a pretty strong indicator.  

You could have them primed and finish spray painted, which would look the best and save you a TON of work, or prime and paint them yourself.

There's no easy way to do it besides scraping and constantly spraying it with hot water.

Why pay for lawn care for $100 per month when you can do decorative rock or other xeriscape designs and hire some neighbor kid to spray weeds once a month? 

@Sylvia B.You asked:Besides spraying our yard perimeter and main trail in the woods...We are considering installing a four poster deer feeder and paying attention to the outcome of the Texas cattle fever tick strategy--feeding deer ivermectin laced corn-only legal by the USDA. hope these links help--my pinterest board https://www.thespruce.com/spray-yard-to-kill-ticks...http://www.crdaniels.com/4posterhttp://www.tahc.texas.gov/news/brochures/TAHCBroch...

I would get several cans of the low expand foam for doors and windows (brand name of 'Great Stuff' is just one of them) and spray foam complete entire window bay from top to bottom.If that stays dry thru a couple cold or wet spells drywall over this area with either drywall rated as moisture proof,,,mold resistant,,, or even use cement board tile backer(that should NOT harbor mold)...Paint to match

@Revis Boyd Isbell IIISpray the walls with TSP solution a few times, allowing the former coat to soak in before spraying a new one.