Pine sap decaying leaves and even road dirt that s drifted into the air can settle on your metal roof and stain it.
How to clean a metal roof from the ground.
For every part water combine 0 05 part mild dish or laundry detergent.
Mix 1 2 cup of tri sodium phosphate tsp in a gallon of water in a bucket.
Spray this mixture onto the roof and agitate it with a soft bristled brush to get it clean.
Remove the particles or pieces that are causing the rust stains.
Opt for something soft to protect your roof s paint and parts.
Cleaning a metal roof.
For any areas that don t wash away with pressurized water fill a bucket or other container with water.
Use a rag to apply to affected spots and use circular wiping motions.
Use a cloth or sponge to clean.
5 parts water 1 part diluted hydrochloric acid or citric acid or muriatic acid or oxalic acid or vinegar.
If needed increase the amount to cover a larger area while keeping the same proportion of water and tsp.
Tsp is available in most paint or home improvement stores.
Mix water and mild detergent for stubborn areas.
Clean the mold and mildew.