There are many alternative ways to make window washing solution, generally with certain common household ingredients, such as ammonia, vinegar, dishwashing liquid, and alcohol.

The dishwashing liquid in the recipes below also helps with cutting grease.
The alcohol in the recipes below is a solvent which dissolves lots of other types of things which can get on your window.
Both alcohol and ammonia evaporate very quickly, so with both you need to make sure that you don't wash your windows on too hot or sunny a day or you may leave streaks.
The vinegar is a mild acid, and therefore can cut through any alkaline grime such as hard water marks on your windows.
Please note that you should not add both vinegar and ammonia together to any homemade glass cleaner recipes, and you should be wary of any recipe you see out there which suggests doing so.
This is not for safety reasons, which is why you should never mix ammonia and bleach together.
Instead, it is just because adding both vinegar and ammonia together into a homemade window washing cleaner just makes the cleaner ineffective.
The reason for this is that vinegar is acidic, while ammonia is basic, so when combined they neutralize each other's pH, which is one of the ways both of these cleaners clean.
Ingredients:
Directions:
Mix all the ingredients together in a spray bottle and use to wash your windows.
Hint: Be careful not to add too much dishwashing liquid, because otherwise you can cause streaking on the windows because there will be a soapy residue on them.
Caution: Be careful with any window washing solution that contains ammonia to not get it into contact with aluminum window frames because the ammonia can pit and damage your aluminum.
Ingredients:
Directions:
Combine the ingredients together in a spray bottle and use to clean your windows.
The quicker you can clean the windows, before the water cools, the more effective this cleaner will be.
I have provided several effective recipes for homemade window cleaning solution here, but there are also many more effective recipes out there.
If you have a recipe you really like and that works well for you, please share your window cleaner recipes with me here, or read other recipes already submitted.

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