[This review was collected as part of a promotion.] Easily connected this cleaner to my pressure washer to try to remove some stains from my concrete driveway. It did a good job at removing some minor dirt and stains. I don't have any super "dirty" areas to put it to a real test yet.

Purchased the surface cleaner a while back but have only just used it. Cleaning built up dirt and moss from an uneven paved area around the pool that would normally take around an hour and a half to clean with my old electric waterblaster, this thing had the job done in under 20 minutes. Extremely impressed. Can't wait to takle the next cleaning job.

This is just what I needed. It cleaned all my surface concrete beautifully, even spots that had never been cleaned before. It takes a little practice to figure out the small downward pressure ("it's all in the wrist") to keep it from lifting off the surface. As far as those guys who complained about the large nut coming loose, if they don't have the mechanical skill to prevent that from happening, they should be kept away from sharp, pointy objects.

This surface cleaner does an outstanding job. The water supplies all the power. All you have to do is guide it over the surface to be cleaned. I cleaned a concrete sidewalk that had never been cleaned. The results were amazing with very little effort. Also cleaned the green growth from a wooden deck without having to use chemicals. The wide path makes these jobs quick.

My driveway had not been cleaned off in at least three years and quite a bit of the drive is under tree cover so it was pretty ugly. \nThis Karcher unit cleaned it up pretty well and relatively quickly. I can still see some brush marks that were left partially due to the flatness of the drive, the amount of dirt to be cleaned up and the failure of the operator (me). I will probably need to run it a second time to clean up the brush marks.\nThe reason for the 4 star rating is that in earlier reviews, there was a mention of the plastic nuts loosening - which they did in the unit I had as well. I tightened the nuts back up and then drilled a pilot hole all the way through the two nuts and ran a stainless screw through the two nuts. (See attached picture) They did not loosen after that.\n\nBeyond that one issue, it's a great unit and I highly recommend it.

The surface cleaner works great. It reduces the time required to clean sidewalks and patios. This unit is not well built to last or for heavy use. I did have to periodically tighten the not on top, but if you plan on light use, this product is a good bargain.

[This review was collected as part of a promotion.] Pressure cleaning my concrete flatwork has always been a difficult, tedious and time consuming burdensome task. I obtained the Karcher 15" Surface Cleaner in the hope that it would reduce the time and effort required. The Karcher 15” Surface Cleaner proved its worth! The Karcher 15” Surface Cleaner is constructed of a plastic housing with replaceable brush bristle type splash guard skirt that confines the spray to the body of the surface cleaner (hover-cover). Underneath, there are two nozzles mounted to a metal, rotating fixture. The top mechanical assembly for attaching the pressure washer lance is solid brass. It is equipped with a standard ¼” quick-connect fitting for the lance, and it freely rotates for elevation angle. Overall the quality of the Karcher Surface Cleaner appears to be very good. When the algae growth on my concrete driveway gets terribly bad, only the use of a turbo-nozzle will remove it. When the staining is not at its worst, the 15° or 25° pressure tips will do a decent job of removal. However, using either a turbo-nozzle or pressure tip on the large driveway, sidewalk and front walk requires a full day of very hard work. At this time, the algae growth was at a moderate level which would have required about five hours of effort just for the driveway. Once I attached the Karcher 15” Surface Cleaner to the lance and tackled the driveway I was really pleased. The Karcher 15” Surface Cleaner was more effective than a 15° pressure tip, and incredibly faster and easier. Working at the appropriate speed to allow the Karcher Surface Cleaner to do its job properly and effectively, the driveway was finished in less than two hours. This was less than half the time that would have otherwise been required, and with far less effort and back strain. I am very pleased and satisfied with the performance of the Karcher 15” Surface Cleaner, and I am glad to have this time saving and effort reducing accessory.

[This review was collected as part of a promotion.] I've only been able to use this once and am quite impressed. It really cleaned the grime that was ground in to the cement and asphalt. I did not realize how dirty the driveway and patio had become over the years. Smooth easy to use with our pressure washer. I never knew this existed and makes cleaning the patio enjoyable. Highly recommend.

The first time I used it it worked very well for an hour, then the nozzles apparently partially plugged up. I unscrewed them and flushed the unit. It works fine now, BUT the plastic nut keeps loosing up, because, by design. the water connection is off center. The resultant moment loosens the nut.

This is a must have for cleaning flat surfaces like driveways. Turns a 6 hour job into a 2 hour job with a smoother result to boot. There is one annoyance with this model. There is a large plastic nut that holds the cover onto the cleaning wand that loosens over time. Unit will begin shake as the nut loosens. I keep 2 large wrenches with me to keep it tightened. I've ordered some loctite that I hope will solve the problem.