I blow the dust off of mine with my air compressor weekly. If there any spots left from something wet that dried on the cluster, I slightly moisten the fluffiest MF towel I can find and wipe the spots off with that.
I have a few very, very mild scratches, but they can only be seen if I shine an LED flashlight at the cluster and contort myself. In other words, my method seems to be working well; that said, there's no flipping reason that the matte finish should scratch so easily.
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