these sorts of posts are always hot topics!!
from the information ive gathered there is a vast array of different prices up and down the country and even in the same streets we work!
the fact is if you provide a good service,are likeable,clean and tidy and adopt a professional attitude without taking yourself too seriously then you are onto a winner.you can charge more than other window cleaners providing you work in more affluent areas.
be flexible with frequencies,offer different ways of paying their bill,offer add ons like conny roof/fascia/soffit and solar panel cleaning,offer text before clean if access an issue.
customers of mine love this and are willing to pay a bit more for a good,reliable service.
i know of a company who work near me and they are in general more expensive than me.they have employees as well but are finding it hard to get more compact work as other window cleaners work that area and have lots of work.its either me or another couple of guys i know so they charge more and inevitably they either drop the work then we pick it up or the customers defer to us as they find out we provide a very good service cheaper and clean for lots of people in the area.
regards
dazmond