Every company claims to offer professional window cleaning services in London but not all fulfill their promises. So, if you are facing tough time in distinguishing between fake and professional window cleaners in London, check out for the following factors. Look at their areas of operation and services offered by them. The Professional window cleaners London offer residential, commercial, water-fed pole and rope access window cleaning services. Enquire about their tools and equipment and ask whether or not they will bring along with themselves. Ask a quote for residential and commercial window cleaning and compare it with others.