Dear Anonymous,

What state, area, location are you looking to work? REO realtors are the best route that I can recommend since they kinda control the "quality" of the houses

If you are looking for Field Services and Preservation Company to preserve and protect your homes, you can contact A2Z Field Services.

A2Z Field Services, founded in 2001, is a nationally recognized inspection and preservation service provider. We are dedicated to assisting mortgage originators, loan servicers, government agencies and real estate auction companies throughout the United States. A2Z assists our clients by providing detailed property condition information, occupancy status and borrower contact information. A2Z also provides a variety of services to preserve and protect collateral once a loan has become delinquent or the property has been vacated. A2Z works to ensure that vacant and abandoned properties are secured quickly and remain protected and preserved throughout the entire foreclosure and REO process. Over the last eight years, A2Z has steadily grown our contractor base and is supported by a nationwide network of over 1500 independent contractors.

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It sounds like you are looking for foreclosure cleaning contracts or trashout contracts.  You will have to get placed on the banks and mortgage asset management companies vendor's list.  They all require you to register to do this. We found a list of all their contacts online and just signed up with them http://bit.ly/banklist , I also highly recommend making sure you are listed in the property preservation directory, www.propertypreservationdirectory.com  Majority of the banks and asset management companies use this directory to find reo vendors in their area, and they also market your property preservation company to the asset managers every month. Also, try setting up a flyer and then distribute it with all the local real estate offices. 

Heres good list of preservation companies

http://www.snapincome.com/foreclosure-property-preservation