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Metal roof fungus.
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You can do this easily with a 1 1 ratio of bleach and water.
In most cases all you need is pressurized water but sometimes you may need a chemical cleaner for especially tough spots.
The sodium hypochlorite solution can be made up from commercially available bleaches.
At first you might think the roof has a problem or has begun to prematurely corrode but often times this is not the case.
Do this the right way to prevent further damage or injury.
Depending on where you live your metal roof could come into contact with metal particles that create rust stains on the paint surface of a metal roof.
If the roof fungi haven t damaged the structural integrity of the roof you should be able to clean it yourself.
Most of these substances can be removed by a mixture of cup tri sodium phosphate and 1 gallon of water.
Spray this mixture onto the roof and agitate it with a soft bristled brush to get it clean.
However it is a valuable test as it will distinguish between fungus and normal inorganic dirt which will not be bleached.
Simply mix the bleach and water spread the mix over your roof with a mop and hose the roof off.
Putting a window in your ceiling.
Metal roofing is pricey but resilient.
Metal roofs are relatively easy to clean with patience.
Do it like a pro.
Bleach kills fungus on contact.