Pricing a window clean is normally straight forward - count the windows and estimate a time. Guttering however seems harder because you are never sure what problems you will get. Did one today and it had a little grass tuft waving away out of the top of the downpipe, looked pretty innocent. I reckon it took a good twenty minutes to disloge the plug of roots and mud before i could suck it out. Really frustrating work. The hardest work is washing the gutters down with wfp.