Actually, I've been noticing the dirty roofs from the beginning. No idea why! But I'm just seeing $$$ everywhere cause like every roof around here is disgusting. Some sort of weird black stains on almost every single one...and that's in all the wealthy neighborhoods. So, either they don't care, or no one is actively pursuing this and it's a potential goldmine. I just don't wanna get into too many ventures at once, but it's definitely on my radar!