I did that and nothing improved. If I power wash it professionally do I have a shot?
Hello again, I am sorry to hear that.The oil has penetrated into the decking material apparently. If soaking with a tide detergent poultice didn't affect it, nothing will.There is less than a 1% chance that any sort of pressure washing will help unfortunately since it only affects the surface.You might try a steam iron on it until you get the boards real hot...You could also stop by the auto supply store and buy a can of 'gunk' de-greaser.. use it after you pour a few gallons of boiling water over the stain, let it set for a while then pour another few gallons of boiler water over it.
Let me know if you get any result at all with it, we can go from there.Phil