I am really impressed with the Glass & Polishig cloth.  I became a believer after one time cleaning the windows in our back door to our garage.  There are 9 lights in the top half of the door and it has always been a chore to clean the individual windows.  I was amazed at how clean the windows are now and how fast it was to complete that task.  Not only will you save money in the long run by not having to buy window cleaners, you are also saving a great deal of time.  I have already returned to the store where I bought my first E-Cloth for more.  I am hooked!