So... after trying many different things when you spill that $@#$#*% oil onto the concrete pavement, i've discovered Tricleaneum. It's almost pure trisodium phosphate.. i've tried all the other stuff (baking soda etc) with mixed (and often disappointing) results. http://www.tricleanium.com.au/ Stubborn old oil stain on pavers that has been there who knows how long: I made it into a paste, put some glad wrap over the top to stop the moisture evaporating, left for an hour or so and washed off with hot water. Not perfect, but the best darned result I have ever had!! Will have to do it again to see if i can get further improvement. Just thought I'd share, after all - knowledge is power and all that. You can buy the stuff from bunnings, about $15 for a kilo of crystals that will give you hours of happy stain removing.
Oil on concrete happens more than we like. If the concrete is treated / painted you simply wipe it up, and clean up with a degreaser / cleaner. I worked for a stamping press manufacturing company, where large quantities of oil would be spilled on the untreated floor when breaking a press down for shipping. We would soak up as much as we could with "kitty litter", which was actually a dried clay product referred to as Oil Dry. We would stir, and work it around occasionally, and when we noted no improvement in the floor appearance, we'd gather it up for disposal. The next step would be to sprinkle mineral spirits (varsol) on the floor and work it with a broom. While the floor is still wet cover it with more kitty litter, and let it dry. Sweep up the litter after the varsol has all been absorbed (save this for the next effort's initial application), and the floor is clean again. The results of the scrubbing of the floor with the broom and varsol will improve with practice. Caution and some ventilation should be used because of the fumes and the associated hazards of using varsol, but we're used to that. Right? Right?!!
Brake cleaner does a good job of thinning oil and removing oil from concrete - use it at work for spills all the time. Old petrol might work as well.
Degreaser and a turbo head on the pressure cleaner works for me. Turbo head has a rotating cylinder in the tip which sprays a conical jet at the ground or whatever you're blasting. It increases the pressure at the blasting point by 1000psi or more. https://m.aliexpress.com/s/item/32816289140.html?spm=a2g0n.search-cache.0.0.353faeecN6dNWD#autostay