J I wouldnt take it to heart mate, it's the same as every section, if you ask on the CC sections how to use Sod Met you'll get told to do training and it's too dangerous etc.
Same on windows, same on hard floors.
Hypo isn't something to be messed around with hence the replies, and something people have put time and effort into researching the best and safest ways to use it.
I think the question has started to pop up over and over again and becomes tiring for some.
However it isn't rocket science and general precautions and sensibility will see you ok, but research first.
You won't need it for a moss covered wall, it's not necessary, it's also called Sodium Hypochlorite.
Rob, you're shying out on the walking, think your legs have gone
Chris, I gathered that but the roof is nackered, hence my question, does it not cause further damage, especially if walked up on?