I have been to look at a large commercial job today and the plus side is it can 99% be done by hand as it is flat roofs all over the complex with this one exception. Now I could just hire in a cherry picker for the day but having assessed the site all the rest of the gutters seem easy enough to do with a vac. Now I bought a vac some years ago, did not get on with it as I was using it for residential and the usual issues with gaps between tiles etc put me off. I know there have been some decent advances in the last few years so perhaps it's time for another foray into a vac system. Now if you were spending my money what would you be spending it on and why? Cheers for the advice. This is the problem building. Due to the back lighting you cant see the two foot weeds growing out of parts along it.