I am not in the practice of recommending products, but I will make an exception in the case of something I recently bought. This is the kind of machine that one might see advertised for sale on some television shopping channel, with some character touting its benefits and sensational price offer...if you call immediately. I have never fallen for such tactics and never will. But...
I am talking about a handheld window washing machine from Karcher, a German company known for high-pressure water machines. I own one, which works very well in cleaning terrace tiles, garbage cans, wheels, etc. Despite my satisfaction, I was skeptical about their latest offer.
Years ago, during my advertising agency phase, I worked on the Colgate Palmolive account. One of the brands was a window washing liquid. Because Colgate was/is a cheap company, unlike its competitors that spend heavily on advertising, we were forced to come up with television commercials to convince consumers of the efficacy of this liquid in ten seconds. The standard length was thirty seconds, but that was too expensive for Colgate. I do not recall the advertising copy, but do recall not having much luck cleaning windows.
Over the years, we have used a window washer in times of sloth, but I still had to clean up after the guy. He tended to leave drops of dirty water on window sills and floors. Some windows in the house have not been washed for years (one can still see out), because I did not want the drippy guy in the room. I have also washed windows using a spray solution and paper towels, when I felt the cleanliness (or, rather, lack there of) had reached an embarrassing state.
I would never have bought a window washing machine, regardless of impressive advertising demonstrations (see above about earlier career). But, I passed a display in a building supply store and decided to give the thing a whirl, despite passing up the chance on other occasions. I was so impressed, that I bought the thing.
Now, I can sit in any room and marvel at my accomplishment...and see clearly. The thing works wonders and is very easy to use. I believe that the key is in the washing solution, which one must buy from them--not Colgate. Not unlike with razor blades, the company makes money on replacement fluid. But, I do not care. It does a better job and is cheaper than a window cleaning guy and does a much better job than I could do with traditional methods.
If you hate washing windows, then get yourself a Karcher thingy.