I can do a 20 x 50 ramp in less than an hour.
Rusty,
These work great! Saves you more time and can be rented from NationsRent at Lowe's or HomeDepot for around $20 / day.
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http://www.amazingmachinery.com/Pressure-Washer-Accessories-SurfaceCleaners.html[/img]
web pageI get one of these to clean my driveway, walks and deck. All my neighbors use it too. Super fast.