We use a 5 5 gallon system just for this reason.
Osphate cleaning concentrates for metal roofs.
All in all if you are dealing with metal surfaces roof asphalt or even tough fabric materials as such then 6071 jomax roof cleaner can be one of the best options for you.
Pine sap decaying leaves and even road dirt that s drifted into the air can settle on your metal roof and stain it.
Rinse the surface well with plain water.
1 3 cup of powdered laundry detergent 1 quart of bleach 5 solution 3 quarts of water.
Clean off the loose stuff use a pressure washer if you can paint this on and wait.
Fortunately quality metal roofs also are one of the easiest types to clean and care for and labor day is an ideal time to consider preparing your roof for the coming season cleaning a metal roof regularly helps reduce damaging elements such as pollution airborne dirt organic material debris pollen and mildew.
It certainly will deliver on its promise which is to eradicate any signs of mossy growth or dark streaks.
Lightly scrub the surface until the area is free of mildew or mold.
It s unreal how well this stuff works.
Most of these substances can be removed by a mixture of cup tri sodium phosphate and 1 gallon of water.
Tsp can be very difficult to mix hot water is recommended but not needed here is a simple method.
Dip a soft brush or rag in the cleanser and apply to affected areas.
Mixing tsp for roof cleaning when mixing the tsp with bleach for roof cleaning you will want to use a pressure washer with the black soft spray chemical injector tip.