i just recieved it, 1gal=16 cups.No info on mixing, to clean mildew & need good info on mixing ????
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This is a concentrated pressure washer-safe detergent, so all you would need to do is pour it into the detergent tank of your 6922 and attach the black spray tip to your wand. The pressure washer's siphon action will add a bit of the detergent to the water stream at low pressure and dilute it properly- usually about 1:10 (1 gallon of concentrate makes 10 gallons of cleaner).
Mildew is tougher to clean than grime and grit- it's a living organism that puts roots down into the surface. Green mold and grime usually clean right off, even on rough cedar- but mildew may take some extra steps. Here's a video with some Removing Mildew From Your Siding basics.
If the mildew has had a while to develop and has stained the surface, more power may not be the answer since you don't want to damage the surface. Using a strong mildew cleaner like bleach, TSP or Jomax will ruin the seals on your pump, so you may want to try applying the cleaner by hand and using the pressure washer to rinse it off, or trying a Foamer that introduces the chemical after your pump. Please protect your eyes and body, your landscaping, pets and kids when using these products, especially on breezy days.