I think its an absolute neccessity to go up a ladder when clearing gutters and thats through experience,you will be amazed at the strange objects you will find lurking in them that have slid down the roof for whatever reason that no guttervac will ever shift(not that i have one). I dont think you are even entering the ball game of gutter cleaning if you are not prepared to go up a ladder and visually inspect,ok theres cctv but thats not going to shift a 5ft long length of 2 by 2 wood or an 18 inch long lump of concrete.