Thread: Chemicals to clean moss off hut roof

I'm after the most aggressive moss killer known to man !

West Coast cabin with moss like shag pile carpet on the shady side
I did the front/ sunny side with the water blaster this week and for most off. But some still stuck on the colour steel.

The back / shady side is epically thick and hard to blast off
This is not a 30 seconds and it dissolves

Who among you actually knows what will kill this stuff ?
Maybe a pre treatment or two.
Treat and blast and the treat again to get at the roots as well

Going back hunting, fishing and golding in January and want to take something that will do everything except melt the roof !