Rectorseal (1-800-231-3345) makes Neutroda powder and Odorgon spray for oil and gas odors. I called the company and tracked the products down via referrals to sales reps and distributors to a to-the-trade seller, Sid Harveys. I chose the spray because I had vertical surfaces to treat. It worked! One can did it. Now the basement area smells like a case of Ivory Soap, but it sure beats the odor of 50 year old fuel oil!