Bid the interior debris as a hazard

at going rate of 2.5 times the normal HUD cyd removal rate since you will be working in a hazardous environment. THEN let the professionals take over by bidding mold remediation. Look on the yellow pages or on this site (there are some with posts) or I go to IICRC.org and find a professional in your area. I see on your profile rubbish removal so I am presuming you are in the P&P field which means you more than likely don't have a commercial pollution liability policy to cover you for potential claims from mold remediation...Could be wrong but most don't. Have fun and wear the proper protection and make sure the work comp policy is paid!