Depending on where you live the debris that is floating in the air could be highly abrasive (i.e. volcanic ash). So if you wipe the surface with anything thats on the screen that's abrasive you will likely scratch it.
The best way to clean your screen is to use can'ed air and blow at an angle to remove anything that is sitting on the screen before you use anything on the glass to polish or wash away any grease or dirt.
If you do need to use a cleaner wet the cloth don't spray the screen directly. And be careful on what you use depending on the screen you can damage it.
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Once it's scratched there is little one can do. Minor scratches can be masked using wax to fill in the voids if you have a gloss screen (nothing for matte screens), but even that has its limits. Trying to scrub out the scratch with a fine polish will take some doing and you have to be careful not to press to hard on the surface as you can damage the LCD below it.
Depending on where you live the debris that is floating in the air could be highly abrasive (i.e. volcanic ash). So if you wipe the surface with anything thats on the screen that's abrasive you will likely scratch it.
The best way to clean your screen is to use can'ed air and blow at an angle to remove anything that is sitting on the screen before you use anything on the glass to polish or wash away any grease or dirt.
If you do need to use a cleaner wet the cloth don't spray the screen directly. And be careful on what you use depending on the screen you can damage it.