Unbeknownst to me, I bought my first house that had had a severe fuel oil spill 5 years prior to my puchasing it. The owners at the time were remodeling the house and had changed the oil furnance to an electric one. In the process they had the oil tank removed, and before cutting the fuel lines that ran from the tank and into and outside of the house, they neglected to check the tank for oil. This resulted in a 3/4 of tank of fuel oil to leak into and outside of the house. The leakage apparently was not discovered until the owners returned to the house the next day. These people did not have the spill professionally cleaned. They attempted to clean the spill themselves and have failed miserably. 5 years after the spill took place we are constantly living with fuel oil odors. I have replaced all of the flooring and have used a chemical called PetroClean on the interior walls but those efforts have not reduced the odors whatsoever. What do I need to do to eliminate the fuel oil odors in my home short of tearing the house down? My house is a small 900 sf. ranch style on a slab. I appreciate any advise you can give me. Thank you, Wendy Vance