you're better asking drive cleaning questions on the general cleaning issues forum because that's where most of the drive cleaning guys are.
i'm not sure you can actually hire flat surface cleaners. i had a look when i was starting out drive cleaning and couldn't find any for hire. Maybe you'll have more luck.
Obviously though you can hire the industrial pressure washers that flat surface cleaners connect to, and they'll come with a pressure washing lance so you can still clean, you'll just have to use purely the lance.