Start with a soft, clean cloth. Microfiber is great. Don't spray
anything on the screen. Instead, dampen the cloth. Plain water is
safest. A 50% mixture of isopropyl alcohol and water works better.
A lot of common cleaning ingredients are not safe for LCD screens.
Apple says not to use alcohol, but diluted isopropyl alcohol seems
to be the exception, according to other manufacturers.
I did mine the other day by applying a very mild solution of warm water
and washing up liquid via a barely damp microfibre cloth. When the
spots and smears seemed to be shifting a bit I used a brand new dry
microfibre cloth to clean it off. I have tried screen wipes for the
job before now and was very disappointed however this method brought my
screen back to good as new condition.
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