re: Cleaning concrete driveway?

Go to home depot and rent the baddest pressure washer they have (should be $30 or so for a day).

Buy a bottle of the Clorox Professional. I think it's a 2 or 3 gallon jug. Stuff is 3x better than regular clorox.

Apply clorox to driveway with pump sprayer. Dilute with water if you wish.

After application, rig up a beer-holder on the pressure washer, while drinking beer.

Spray off clorox with pressure washer. Keep ice-chest close, drinking often.

All the runoff will have all the night-crawlers on the edge of the driveway crawling out of the ground to escape the clorox. Pick them up and place in a bucket.

Go fishing at night after you return the pressure washer.