Has anybody been successful in removing sump oil stains from a car, that has gone onto sand-wash concrete please, and if so what did you exactly ?
 

Very difficult to get a perfect result since in removing the stain the whole area cleaned will end up appearing lighter than the surround. However , weathering a month or two can improve this appearance. Youtube has a lot of suggested solutions but none seem perfect. The pick of the bunch seems to be this one but ......no guarantees. 

 

 

Here's a top secret remedy I learned from an old witch, waagaaay back. Get a few large toads and put them in a blender. Paint the resulting goop over the offering surface, and chant the following phrase 3 times: "pinlkjdxulkjbcwiuxhg xw k" and the satin will magically disappear. 

 

Note I accept no responsibility for any damage to your property using this method. 

Brake cleaner will remove almost all of it.

https://www.allstate.com/resources/car-insurance/how-to-remove-oil-from-driveway

 

Plenty of advice on Youtube.

Fairy Liquid, kettle of boiling water and a good scrub.

White vinegar cleans everything but if it fails cook some chips ????  

Coca Cola is reputed to remove oil stains.

You could try rubbing cat litter into it with your foot, wearing shoes obviously before, some noodle here remarks on that, its used in workshops now in the real world. 

Solve oil with plenty petrol and absorb with old cloths, paper or whatever absorbs, dry sand, maybe even cat litter.

If you use solvent, dont have any fire in close proxi and vent.

Maybe a last time with just water and detergent, flushing all away.