Remove residue from repeated usage of commercial cleaners. In a spray bottle, mix 1/4 cup castile soap with 1 cup vinegar and 1 gallon water. Spray your windows and wipe them dry with paper towels or old newspapers until the residue is removed.
Maintain a streak-free shine on your glass and prevent wintertime frost from collecting on your windows. Mix 1/2 cup of rubbing (isopropyl) alcohol to 1 qt. (4 cups) of water. Spray your glass in a well-ventilated area and wipe clean with paper towels or newspaper.
Create a fresh-smelling glass cleaner by adding lemon juice to your spray bottle. Combine 1/2 cup lemon juice with 2 cups water and clean glass as usual. If you want the cleaner to be even more effective, add a small amount (less than 1 tsp.) of castile soap.
Reduce streaking by adding cornstarch. Mix 1 tbsp. cornstarch with 1 qt. (4 cups) warm water and 1/4 cup white vinegar. This mixture dries quickly, so spray your windows on a shady or cool day.
Remove hard water buildup on glass by using white vinegar full strength. Most water deposits come off with a vinegar/water mixture of 1 to 1, but stubborn stains may require pure vinegar. Spray the vinegar on your glass in a well-ventilated area, as vinegar will make your eyes water and make breathing difficult if you inhale too much.
Clean and disinfect glass by adding ammonia. In the spray bottle, combine 4 tbsp. ammonia, 2 tbsp. vinegar and 1 qt. (4 cups) water. Spray and wipe as usual. This cleaner is especially good for kitchens and bathrooms—areas that tend to collect germs.