I need to have my driveway and sidewalk cleaned for my company that will be in town in the next few days!

Few companies do this kind of work since a teenager with a pressure washer can do it at handuman rates. You can try the yellow pages looking for deck washer outfits but I'd rent of buy a washer and do it myself, it's a very low skill task.

You can find someone for about 10-15 cents a square foot