Windex (the blue kind) includes two toxic ingredients. Ethylene glycol and isopropanol. I found out that Ethylene glycol is highly poisonous, and has a syrupy sweet taste (a problem if you have children who like to put their mouths on everything). Isopropanol is a type of alcohol that is less harmful when used properly, but highly flammable and is used in certain explosives. Johnson and Johnson must have also realized this, because they came out with Windex Natures’ Source recently, and it doesn’t include either ingredient. (Congrats to J&J for cleaning up the product!)
There are a plethora of glass-cleaner recipes on the web, and I tried a few and came up with this one. I use this all the time around the house, with either a microfiber towel, newspaper or brown paper. My mirrors shine, and it cuts right through soap scum on out shower door. I also use it on chrome and the car windows. And the cost? Pennies.
Homemade Glass and Window Cleaner
Pour all ingredients into a spray bottle. (I use an old washed out Windex bottle so we always know what it is).