You're talking the type with the brushes on the edge and the rotating nozzles inside right? I used one on my wood deck before I painted / stained it again last year. It worked good to get the flaking paint off and the grime. The bennifit was that it held the nozzles away from the wood and didn't destroy it. ( I controlled the pressure too.)
It would be fine on the concrete especially if it's old and weathered, a strong PW can etch weak concrete even more. As was said, you may need a degreaser or something down and scrub as you wash. Good luck. Grant
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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