most likely you'll wash the house first --correct ? This will clean the gutters. What's left is the vertical striping.
Doesn't require a brush.It's a chemical thing. You're breaking it down and wiping it off. Bleach won't break it down.
it's spelled "Awesome" so you search for the right product. You can buy more expensive cleaners, but you'll pay extra "of course". But "why" ?
*** for the record---i've never used F-13