priced up a job for cleaning sofits and gutters today (upvc) a semi detached house gutter on front and on the back i quoted £50.. i have a square vikan which i dont use just wondering if this would be any good for the job and do i use any sort of detergeant first , the gutters are not really in that bad a way.. ive never priced up this type of job before so dont know weather price i quoted is right..