I noted that he was going to use simple green to do the cleanup (great stuff). However, I use cement powder (or a simple bagged sand grout) as a cleanup trick. Spread enough on the spill to show no more absorption showing through, and leave it for a couple of hours. Then broom it back and forth a few times to mix and pick up residual oil, scoop it up, and dispose of it in a suitable manner (on a gravelly part of the driveway, for instance....sshhhh, don't tell the EPA).
Some years ago, my brother-in-law had an old Taurus that marked territory quite enthusiastically (3 litres over night on my concrete drive). Grout mix took care of the spill, and you'd never know that the Exon Valdez had been in my driveway to this day.
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