Coincidentally, we have a hole developed in our roof, and water penetration, coming through the bedroom ceiling.
We had the insurance assessor visit yesterday, and he advised that moss must always be removed and inhibitor used. So that is what will be done - using a brush - softish.
The other piece of bad news however, is that our house, being the age it is, may have asbestos mixed with the ceiling plaster😮 which means that it will have to be sealed off and ceiling completely removed and replaced.
The good news is that it will be payed by the house insurance.
But I hate this sort of disruption.