Can "gas" clean roofs

I just got back from quoting a house and he said that he knew a company that would spray a gas on the roof and then the next time it rained it would be clean. Have any of you heard of this?

Doesn’t sound too environmentally friendly.

Sounds pretty dangerous also

I heard it works for bed bugs too. Haha

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I heard hydrocloric acid works well too…

Has anyone tried 5w-30 motor oil yet?

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Friction + gas = ER