Clean off the loose stuff use a pressure washer if you can paint this on and wait.
Osphate cleaning concentrates for metal roofs.
Tsp can be very difficult to mix hot water is recommended but not needed here is a simple method.
We use a 5 5 gallon system just for this reason.
It s unreal how well this stuff works.
Rinse the surface well with plain water.
Lightly scrub the surface until the area is free of mildew or mold.
I shared my discovery with a friend and he pointed me to the data sheets for this and klean strip s phosphoric prep and etch product.
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.
Dip a soft brush or rag in the cleanser and apply to affected areas.
Pine sap decaying leaves and even road dirt that s drifted into the air can settle on your metal roof and stain it.
Spray this mixture onto the roof and agitate it with a soft bristled brush to get it clean.
1 3 cup of powdered laundry detergent 1 quart of bleach 5 solution 3 quarts of water.
Some spots got cleaned so well i could see shiny bare metal.
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.