1. a few decades ago
   until recently
2. it still is safe

A few decades ago, glass cleaner was a safe multi-purpose cleaner, suitable for use on many household items, including computer and television screens.

1. bleach
   alcohol
2. ammonia

Ammonia is the principle ingredient cited for making glass cleaner a bad choice for modern day screens. Truth be told, there are other compounds in the mixture which are also damaging to screens.

1. It corrodes the screen's coating.
   It cracks and yellows the anti-glare coating on the screen.
2. It creates splotches on the screen.

Modern day screens are coated with anti-glare and anti-static film, which will crack and yellow after multiple applications of glass cleaners.

1. Assume that it is not.
   Read your manufacturer's instructions.
2. Try a small corner and see if it does any damage.

Read your manufacturer's instructions for advice on how to clean it. Do not use glass cleaner unless it says it is okay, because the effect is cumulative and you may not see the damage until after multiple applications.

1. Rubbing with moistened newspaper.
   Wiping with a slightly dampened soft cloth.
2. Wiping with a wet cloth soaked in baking soda and water.

Wipe the screen gently with a soft cloth moistened with distilled water or a vinegar solution.

1. one part vinegar to one part water
   one part vinegar to two parts water
2. two parts vinegar to one part water

If your manufacturer's guide doesn't suggest a cleaning method, then use a vinegar mixture: 50/50, or one part vinegar to one part water.

1. paper towel
   newspaper
2. baking soda

Never clean a glass screen with paper towels; they leave lint and streaks across the screen.

1. Spray it liberally over your computer.
   Spray it carefully on your screen only.
2. Spray some on a soft cloth.

Never spray anything directly onto your computer. Spray some product on a soft cloth.

1. imitation vinegar
   acetone
2. water

Keep these chemicals away from your computer screen: acetone, ethyl alcohol, ethyl acid, methyl chloride and toluene.

1. Use a microfiber or optical cloth instead.
   Use hot water.
2. Rub vigorously.

Use a microfiber or optical cloth instead; they have dense hairs that grab hold of the grime. Don't rub too vigorously, or you will crush the pixels in the screen.