Most electric power washers with a rating of a minimum 3000 psi and a flow rate of 4 gallons per minute should be effective to be used as concrete cleaners.
However, if you need to power wash hard contaminants like paint or thick vehicle skid marks, you will need a high pressure washer with a higher rating.
If your concrete is laid in a large flat area such as a warehouse, parking area or a tennis court, there are flat cart mounted power washers that resemble a lawn mower and make the job easier. The hot water pressure washers are more expensive and heavier than the cold-water type but they are excellent to remove oil and grease and to work in colder weather.
You may also want to consider a trailer mounted pressure washer depending on the size of your job.
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Need a little more scrubbing power? Want to increase your cleaning efficiency?
Ultimate Washer offers a variety of Rotary Nozzles from which you can choose. Your cleaning time can be cut in half with the addition of this nozzle. These nozzles rotate at high speeds to increase the intensity of the spray. They can remove rust, graffiti, and barnacles from the bottom of boats just to mention a few. They can be used on pressure washers with as little as 3000 PSI up to the super heavy duty pressure washers whose PSI reaches 5000 PSI. Find more info at http://www.ultimatewasher.com/pressure-washer-rotary-nozzles.htm