ChrisC as you asked what do I use to clean the roofs.... In terms of tools I use two scrapers and a wire brush then a standard hand brush...It is a laborious task indeed. one scraper is just a standard wall paper scraper the other is one I made up to clear out the vertical groves between tiles, where the moss gets a grip then it builds up on the tails of the tiles in that they being concrete, is rough and thick giving the moss somewhere to root into...sigh! I use the scraper to clean the whole surface of the tile removing the bird poop that no doubt feeds the moss, scrape the moss of the tails and out of the grooves, then wire brush the tails to remove the roots finishing of with the normal brush....What fun..!

This time of year the roofs tend to be damp most days and not a place to be without a reasonable safe (ish) working plan. I have borrowed a wheeled zip-up type alloy scaffold to provide a platform at gutter height and from the platform I fix a long alloy ladder lying flat on the roof tiles from which I can work up to ridge height. For the sections between house and garage where the scaffold can not be used to fix the ladder to, I bought a kit of parts to convert the ladder with a hook arrangement that rises up over the ridge and rests on the tiles on the other side of the roof converting it to a roofers ridge ladder.

Seems I made a rod to whip my own back in that when I thought to extend the place, I built the garage to housing spec with attic trusses in the off chance it might be converted to whatever use in time, I used the same style attic trusses on the large extension to the house and raising the roof line, again to provide accommodation space should that ever be a plan, not that I would ever have any use for that amount of space, but hoping to add value should the place require or desire to be sold to pay for nursing home fees or suchlike... Sigh..!

End product is rather a lot of roof area... doh

[Linked Image]

[Linked Image]