right found my book (Fix It by Scott McGregor) with the info in it - has 3 different options
a) kitty litter - I nearly had it right -I think I didn't follow it exactly because it was on the driveway out the front of the house accessible to the street.
try a bag of kitty litter and an old brick. Cover the stain with kitty litter and then grind it into a fine powder with the brick. Let it sit and soak up the oil for a day or two, then sweep it up.
b) commercial driveway or engine degreaser
[If the stain remains,] try a commercial driveway cleaner or even some engine degreaser, but always try these chemicals on a discreet area of your concrete first in case they discolour it.
c) eucalyptus oil
Pour undiluted eucalyptus oil directly onto the stain and let it sit for a while to dissolve the oily marks, before scrubbing the area clean with warm soapy water
(most grease & tyre tracks marks can be removed with driveway cleaning products found in both hardware and motor accessory shops)
hope these help - with the kitty litter I didn't bother to grind it up more and it still worked, it might have been a reason why I needed to re-apply but I also only left it on for a couple of hours too.
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