A typical solution used by professionals is 3/4 cup clear ammonia or white vinegar, 1 gallon of water and 2 to 4 teaspoons blue Dawn dishwashing liquid combined in a bucket.
Professional window cleaners use a solution made from dish soap and water to achieve a streak-free clean. The key is to use a small amount of soap and distilled water. Some professionals add ammonia to the water for increased cleaning power.
Many leading window cleaning products contain ammonia because it is widely considered the best surfactant that gets the job done without leaving streaks. For that reason, many householders and commercial cleaners demand glass cleaners containing ammonia, such as Windex®.
The best homemade window cleaning solution is to just mix two gallons of water and about a teaspoon of dishwashing liquid together in your bucket. Some people also opt to use vinegar and water to clean windows. In warm weather, you'll get a little more working time by using cool water.
In a spray bottle, combine ¼ cup of white vinegar with ½ teaspoon of liquid dish soap. Dilute the solution with 2 cups of water, then shake the bottle vigorously to mix the components. If you don't have white vinegar on hand, you can substitute it with lemon juice.
Spray a stronger mix of 1:1 water and vinegar (or Windex, or glass cleaner) at your window, so that the solution covers most of the glass. (I found Windex to work better, but if you have pets—or kids—who frequently lick outdoor windows, vinegar may be the best route for you.)
Mix up your window-cleaning solution: In a plastic spray bottle, mix together 2 cups of warm water with 1/4 cup white vinegar and 1/2 teaspoon of Dawn. Sweep away dirt: Using a broom, sweep away the cobwebs and debris from the windows and sills.
Make your own cleaning solution by simply mixing 50 per cent vinegar and 50 per cent water in a spray bottle. Spray your window, let it sit, then grab a microfibre cloth and give everything a good wipe. If there are still streaks, flip your cloth to the other side and give it a second going-over.
Professional window cleaners like Window Genie are trained and experienced in this battle. Window Genie uses a polishing paste specifically designed to fight the minerals that create these stains. The paste is applied to a non-abrasive cleaning pad and the window is lightly scrubbed.
Distilled vinegar and hot water
A true tried and tested method, distilled vinegar and hot water has proven to be one of the most successful methods to clean your windows.
The blue solution in the reservoir is an alcohol-based glass cleaner probably diluted with some water. After multiple people have wiped bugs, mud, oil, and gasoline off their vehicle using the squeegee and dunked it back into the tub, that fluid is more filth than detergent.
Mix one part distilled vinegar to 10 parts warm water in a spray bottle. Wipe down the window with a a soft, clean, lint-free microfiber cloth or paper towel to remove dust before you spray your solution, then spray the entire surface.
Almost all of the glass cleaners contain glycol ethers, usually ethylene glycol monobutyl ether. Alcohol, such as isopropanol, is also commonly found, as well as ammonia.
You can clean water marks off of clear glass with CLR® Calcium, Lime & Rust Remover.
First, mix water and vinegar into a bottle, preferably with a spray nozzle. The mixture should be ⅓ water to ⅔ vinegar. Spray the solution over a window with hard water stains and let soak for 1-2 minutes. Second, wipe off with a dry cloth.
“Vinegar is a good cleaner because it's acidic, but when you add dishwashing liquid/dish soap to it (which is a base or neutral) - you neutralise the vinegar. You take away the very thing that makes it work well. “The dishwashing liquid works that well on its own. Adding the vinegar is a pointless step.”
For most windows, combine equal parts distilled water and white vinegar. In most cases, it's best to do this in a spray bottle, but for larger windows combine more liquid in a bucket. For very dirty windows, especially exterior windows, combine 2 cups of water, 1/4 cup of vinegar, and 1/2 tsp of dish detergent.
A big problem is the evaporation rate. If you're cleaning your windows on a warm sunny day, the liquid part of the solution evaporates quickly and leaves behind a residue that appears as streaks. On the other hand, if you don't entirely remove the liquid you can also be left with a streaky window.
Cleaning glass is more about the tools than the elbow grease. Even if you do exactly the right things, like mixing vinegar with distilled water and wiping with newspaper, it's possible to end up with a frustrating streak or three. In that case, the simplest solution is to finish the job with a quick buff.