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We have a Karcher that is only rated at 1200 or 1300 psi. We use it with the 'softer' nozzle on the Montana and it does a great job but not alone. I wet the side down with a Car wash mix with the Karcher and then use a long handle wash brush to clean it. Then I use the karcher with the 'softer' nozzle to rinse it off. It takes me only about 2 to 3 hours to do the whole rig, even if there are some black streak on the Montana. For stubborn black streaks I squirt them with black streak remover, leave them for a minute and then brush it off. No problem!
By the softer nozzle I mean the one that has the wider spray not the smaller one that is conical in shape and buzzes as it works. That one can bore a hole in anything!
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