Anyone downstream f-10

i have some pine that is on the inside of of a screen porch that has mildew all over it. ceiling is 14’ high. spraying it with f-10 from pressuretek with a pump sprayer would be ridiculous. has anyone downstreamed it? is it doable and if so, what ratio should i use?

You can Not mix f10 strong enough to downstream. We use our Roof pump for spraying it. You may need to use your house wash mix to get rid of the mildew. Then spray F8 which is a brighter on it.