I second that, Greg that's pretty harsh.

You spend so much time and so much money on chemicals to get it less clean with a longer drying time, I'll never DIY carpet cleaning again.

Does anyone know if I can just spray it with mold chemicals and paint over it with mold inhibiting paint instead of painstakingly knocking all this material out from behind the studs?

@Diane G. maybe I was a bit harsh, but people do need to understand no investment is a guarantee/ensured.

I don't mean to sound harsh but more then likely he or she is more concerned with selling the deal before the contract expires. 

April,  you can due as @Ryan Booth had suggested and use a wire brush or fur out the walls and hang drywall. you could use a chemical stripper to take the paint off, or not go through all that and take a putty knife, or a strong spackle knife that isn't flimsy, and scrape away any loose paint. then try to coat the wall with a layer of drywall mud. if there is loose paint that you missed the moisture from the drywall mud will raise it up. you just take that off and patch it with the mud. that may save you hours of work trying to remove the paint.

I am sorry for being harsh, but I think you need to do a lot more research just based on the questions you are asking.There is a reason why hotels have the highest returns out of all real estate asset classes...it requires the most time and energy.

But when he moved out we had a colony of bed bugs that had never been seen before. 12 chemical treatments and 6 heat treatments (I even stopped by the last one and gave the techs $100 bill to crank it to the max) and six months of no rent.

Hopefully not too harsh.

I'll probably drop all chemical spreading this year because it's too expensive.