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PressurePros said:
Everybody pretty much nailed it.
• Pre-wet
• Use the lowest possible chem dilution that gets the job done (which is about 1.5% sodium hypochlorite hitting the house)
• Don't let chem mix dry anywhere

Driveway rinsing is where you will regret buying anything less than a 4 gpm machine. You best bet is to run the garden hose at that point.
Right on! Great answer. Pre-wetting is key! Also, if you use well water it can be hard water and leave a white haze over everything. Next time it rains it will wash off the hard water.
 
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