i tell people 20 pounds a side for gutter clearance, more if theres weeds, grass or trees( yes ive had mini trees growing in 2 so far last year). If its not hard work I might knock some money off too, it works well as some of my customers live underneath trees and i find i get good repeat business and recommendations too, just the same as window cleaning.
While im there its a good opportunity to tell them i clean outside of gutters too20 pounds a side, customers especially like the idea of nice clean WHITE gutters also.