My next door neighbor decided to saturate panels of our steel fence with cooking oil to stop the rust (which was expected and is a desired patina).
How can we get rid of the old oil smell and get the oily stain off the fence?
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You will want to use something that is non-toxic and biodegradable since it is outdoors.
I would recommend using car wash soap, and wash it the same way as you would with your car. It has degreasers in it, and is usually safe. Mix a small amount with hot water, and scrub the fence with a stiff bristled broom. Spray the fence with water, and then scrub with the soapy water and let it sit for a few minutes, and then rinse.
You may need to repeat a few times to get all of the oil off. A pressure washer will speed up the process.
Most solvents will remove oil. if you really want to strip the oil quickly brake cleaner is amazing and bare metal starts rusting quickly after cleaning with this product. I use it quite a bit and it is one of the best degreasers I have found.