mudsticks
Obviously an Aubergine
I think that's junk, like putting white wine on a red wine stain: all it does is dilute the black oil stain with "clean" oil and if the black oil has enough black matter mixed in, you then just have a bigger slightly-less-black oil stain to clean up. If it manages to "just lift right off", there wasn't that much black matter in it anyway.
The way to remove oil is soap, which suspends the oil in water so it can be washed off. Mechanically, soap with some small solids in, to help work it into the small dents and gaps, such as Swarfega Orange (which has couscous-like granules in), is slightly more effective than soap alone.
Well it works for me, which is why I posted it.
It was in fact filthy stuff from off of the tractor, proper black, and a good quantity too.
But it's fine you don't have to believe me.
Others can try it for themselves, if they like.