Over time, your monitor can developed smudges.There are some general guidelines I will share though:
It is usually best to turn off your monitor so that you can see the smudges better. Always use a soft cotton cloth dampened with warm water and wipe either from top to bottom or side to side. Avoid using a swirling motion. Avoid using Windex or any ammonia-based cleaners as they will yellow your screen over time.
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