Had our refrigerator replaced last week. The delivery truck left a huge oil spot on our concrete driveway. Nasty black oil too. Looks like it had never been changed. Anyway, I tried to clean that mess up today. I figured Dawn would loosen the oil up so I put that on full strength, scrubbed it into the oil spot, gave it 4 or 5 minutes to work, then hit it with the pressure washer. That only got about half the stain.
So, it looks like I need a better solvent/degreaser. Can anyone give a tried and true recommendation?
Thanks for your help.