The cost of power washing your steps and walkway is dependent on the company you are dealing with. Usually, groundwork is priced at between 15 and 30 cents per square foot, but some companies have a minimum charge. Call a power washing company and ask for a quote.
If your cleanen concrete walkway before u give your money away to power wash the life from concrete try powder laundry soap on wet surface and scrub to suds with a broom let stand ten min. then rinse. It drys and looks new. Cheap to!