In short, yes, window cleaning can be a great career. It's very cost-effective, since payments are collected on the spot, revenues are recurring and overheads are very low. A typical day as a window cleaner includes doing surveys, bidding for jobs, scheduling visits, managing customer service and daily operations. As you can see in this forum, there are several thousand members here who clean windows for a living.
Some can do it part time, but most I dare say they do it full time like me. This is one of the easiest businesses to start, in part because of the low initial investment. As you read these threads, you'll see that there's a lot more to the business once you get started. There is a lot to learn and many areas that can generate additional income along with windows.
You can expand it as much as you want. There are no limits other than those you set for yourself. It requires work and time, but anything worthwhile is worth it. Combine it with the pressure washer kit for diversified revenue streams and power window washing capabilities.
Now, the large number of windows can be a bit intimidating, depending on the type of business, but for this reason, low-rise commercial buildings can also be one of the most lucrative areas of professional window cleaning. Be sure to tell anyone who manages or owns a local business about your new window washing business. Seattle window cleaners make it easy to see how much it costs to wash windows, clean roofs, pressure wash, clean gutters and scrub coatings. Well, there are two competitors (I forgot about this other company) who are strictly dedicated to window cleaning, but he does pressure washing and gutter cleaning.
You may think that you need to work in large buildings, such as some professional window washing businesses, to make a profit.