Ugh! Today was the day to tackle window cleaning. A chore that I have not enjoyed since I was a kid. Seems like they never come completely clean, and getting the streaks out - again, ugh!
But today I was using a magic mixture that I learned from my childhood and had completely forgotten about. I use a cup of white vinegar in my dishwasher 4 times a year to help keep it clean smelling, and while I was running the cycle I remembered using white vinegar and distilled water in equal parts to get windows clean and shiny and without streaks. By the time I was in my 30s I also started using a couple of drops of Dawn dishwashing liquid into the mix, which somehow made the process even easier.
So, to get your windows clean without the expense of a window cleaner use a spray bottle with 1/2 part distilled water and 1//2 part white vinegar and a couple of drops of Dawn (I don't know if other dishwashing liquids also work or not) and spray and clean and get it done fast.
Hope this makes for a pleasant chore for you.