Chicken Pox for old people. Shingles are gross
Get your hands on TSP to mix in with it. I don't know what the law is in FL, but they removed it from shelves here in GA (hippies), but you can order it on Amazon. Bleach will kill and hide the surface algae that's causing the discolor, the TSP will knock the colony out. They'll eventually come back, because they're everywhere, but it will take much longer than with bleach alone.Get a cheap pump sprayer from home depot or lowes. Then mix some water and bleach. Go up on the room and spray it on.