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Pressure Washers for Parking Lots and Large Paved Areas
What Size Pressure Washer Cleans a Parking Lot Efficiently?
Parking lots reward flow over peak pressure, since GPM is what covers large flat area fast. A gas unit at 3,000 to 4,000 PSI and 3.5 to 5 GPM, paired with a 20 to 30 inch surface cleaner, clears an even path many times faster than a wand and leaves no stripes. Gas is standard because most lots have no power nearby, and a belt-drive pump holds up to the long runtime a full lot demands. Size the surface cleaner to the machine's GPM: an undersized machine starves a wide cleaner and slows you down more than a smaller head would.
How Do You Remove Oil and Tire Marks from a Lot?
Set-in oil and tire rubber need hot water or a degreaser plus 3,000-plus PSI, because cold water alone will not lift them. Apply an alkaline degreaser, let it dwell five to ten minutes without drying, then clean with the surface cleaner and follow with a wand at a 15 to 25 degree tip on the worst spots. Overnight cleaning, when traffic is lowest, lets you block sections and work without disrupting customers, and it gives oil spots time to dwell between passes.
What About Wastewater Runoff Rules?
Parking lot wash water carries oil and sediment that stormwater rules regulate, so you often need to capture and dispose of it rather than letting it reach a storm drain. Check the EPA stormwater discharge guidance and your local municipal rules before a large job, and plan a berm-and-vacuum recovery or a mat system into the equipment list and the schedule. Recovery is easier to build in from the start than to retrofit once a site flags a violation.
Related: Hot Water Pressure Washers · Pressure Washers for Concrete · Pressure Washers for Sidewalks · Pressure Washers
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