Never wash windows while the sun is shining on them because they dry too quickly and leave streaks.
When polishing windows use up and down strokes on one side of the window and side to side strokes on the other to tell which side requires extra polishing
To polish windows or mirrors to a sparkling shine, try a natural linen towel or other soft cloth, a clean, damp chamois cloth, or crumpled newspaper
One word of warning about newspaper: while newspaper does leave glass lint-free with a dirt- resistant film, persons with sensitivities to fumes from newsprint may wish to avoid the use of newspaper as a cleaning tool.
To clean water stains, use any good glass cleaner and steel wool to scrub them off gently.
Wash windows or glass with a mixture of equal pans of white vinegar and warm water. Dry with a soft cloth. Leaves windows and glass streak less. To remove those stubborn hard water sprinkler spots and streaks, use undiluted vinegar.
Borax or Washing Soda:
Two tablespoons of borax or washing soda mixed into 3 cups water makes a good window cleaner. Apply to surface and wipe dry.
Mix 1 tablespoon lemon juice in 1 quart water. Apply to surface and wipe dry.
To clean cut glass, sprinkle baking soda on a damp rag and clean glass. Rinse with clean water and polish with a soft cloth.
Glasses to block off sunrays are best cleaned by spraying detergent solution on them and then wipe it off using paper towels.
Clean interior automotive windows by spraying a mild detergent based cleaner on them and then washing them thoroughly until the cleaner washes off.