If you can reach it with an extension cord, you could use an electric sander. But you'd have to clean everything up very well after that, because you don't want the birds eating paint particles. Then you could paint a darker color so stains are less visible.Thank Y'all! I'll probably update with more pics every few months to verify when their growing, but thank you guys for the help!
Sidenote: Also if anyone has any ideas how to get the poop of the wall it would be bery much appreciated, I've tried so many things in the past couple years and nothings seemed to work. I'm on the edge of just painting over it at this point.
Honestly, it doesn't look too bad to me. Chicken coops don't need to look sparkling clean, in my book, anyway.