Why does the MBP manual warn you from using glass cleaner on your display?

I think the title says it all ...
Thanks for your answers!
null

I think the main reason is that there can be a lot of things on the market passing for glass cleaner the world over and Apple has no way of knowing what a user might end up applying, so it's safest for them to say use water, which by the way isn't such a bad idea.
Also to consider, a lot of glass cleaners come in spray bottles. There are risks to using this type of applicator around a computer. One risk for example is the nozzle isn't pointing at the screen, or is partially clogged, and it squirts errantly, like into the keyboard. Another risk is that too large an amount come out of the applicator and a big drip runs down the screen and goes behind the bezel where it can do a lot of harm.
If you do use a glass cleaner, especially from a spray bottle, always apply it to the cloth you are using as a wipe rather than try to apply it to the screen. And if you use a spray bottle, move far enough away from the computer when you spray into the cloth so that a bunch of aerosol droplets don't settle all over the computer.

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