[JGibson]

Originally Posted by positiveinlife

I stopped using the power washer for the house and driveway. 30 second cleaner has performed better than I expected with less time and great results. just spray on and rinse.
30 SECONDS 1-Gallon Mold and Mildew Stain Remover Concentrated Outdoor Cleaner in the Outdoor Cleaners department at Lowes.com

I'm guessing the pressure from your house bib is 80 PSI with the cleaner is more than good enough.