Foreclosure realtors are your best source for this work. They pay $1 per square foot (up to $2,500 when a home is filled with furniture and trash). Below is a link to foreclosures and their realtors, call them and ask to bid on the work.

I would highly recommend getting a good reo asset management company or foreclosure cleanup bank contact list and getting registered with all the banks. You can get a good list at the website below, it is very accurate. Also, try sending the reo agents in your area an email flyer, this usually works

If you're in Wayne, Oakland, or Macomb county I know a few companies. I'm using one to do a trash out on Greenview in Detroit.

Must banks assign a 3rd party vendor who handle all these issues, you need to complete research locate all these companies who offer that services. GREAT business to be in.
http://www.lynn911.com http://www.homes-for-sale-dallas.com

Contact some of the Realtors here locally that deal strictly with foreclosures, like Ron Walraven or someone like that. They'll likely be able to steer you in the right direction. It's a disgusting job!