how do i clean a metal roof?

[buckwheat]

have a metal roof on shed an would like to clean the black algae......will phosphate free tsp work ok?

[hrhofmann]

Carefully, wet metal is slippery.

[dadiOH]

I doubt it. A quart of bleach in a gallon of water should kill it; once dead, mayve broom it off?

[bob haller]

dont walk on roof, use brush on a long pole, with detergent and minimal bleach since strong bleach can damage paint

[Moe DeLoughan]

That is literally overkill. A 10:1 ratio is all you need, and it won't burn your skin or pull color from your clothes if you spill it.

[Stormin Mormon]

I've found bleach and water (half and half) worked on a friend's roof to kill the moss.

- . Christopher A. Young learn more about Jesus .

. .

[bob haller]

A roofer friend of mine, a personal buddy reports he LOVES people who blech roofs.........

it causes damage and leads to early replacement