How many years do they reckon on it staying clear? This roof I did, I clean the windows and I cant help noticing a couple of little bits of moss id missed, so i presume it will grow back from this. Lucky its bone dry round here, hopefully last some years.I just explained that the real results will show in 10-14 weeks and she was fine about it.
Dunno about mistakes as this was my first, but i did make 1 error i wont make again, i did both sides then realised i should have done risge tiles first lol, coz when i did the ridge tiles it all fell onto the tiles again.
The best tip, ive had from experienced roof cleaners is, scrqpe it all down to the bottom 2 tiles and vacuum it off the bottom 2 tiles rather than just clog the gutter or cover the ground with the moss.