there are companies that are contracted by insurance companies to do the worst and most difficult cleanings. for example if a person comitted suicide with a shot gun, that leaves an unbelieveable mess. the cleaning co. that comes in will literally make it appear as if it never happened. also, after a house fire they can come in and make an inventory of of each thing in the home, right down to how many hair pins were in what drawer. they clean everything. the bigger items such as furniture goes into a special room that processes and removes all smoke odor.