Gutter cleaning on a house on Auburn Grove, Armadale, a street that runs down to High Street. The gutters had not been touched in years and there was grass growing along the length of them, on a sheet metal roof. One technician, five hours. Everything came out by hand first, and only then did any pressure go near a downpipe. That order is not a preference.

Grass tells you how long it has been, and it also tells you what is underneath it. Not leaf, but the soil leaf eventually turns into, with a root system running through it that holds the whole length of the run together as one piece. The temptation with a blockage in that state is to put pressure straight on it, because pressure is quick and the material is heavy and nobody enjoys lifting it by hand. On a gutter this far gone, that is the single thing that makes it worse.
Pressure into a gutter full of rooted material does not remove the material. It breaks the fine fraction off it and sends that straight down the downpipe, where it settles at the first bend and sets. You end up with a gutter that looks clear from the ladder and a downpipe that is now solid, which is the harder of the two problems and the one you cannot see. So the whole run came out by hand first. Grass, root mat and the soil underneath it, lifted out rather than pushed along, until there was nothing left in the gutter that water could carry anywhere. Only then did the downpipes get pressure, and at that point it does exactly what it is good for: clearing the line instead of feeding it. Each outlet was checked for flow afterwards rather than assumed clear. One technician, five hours. This is the kind of job that does not get faster with a second person, because pulling a rooted run out is sequential work along one gutter rather than something two people can split between them.
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