Also - I have a plastic sheet protector over the screen, to help keep it clean. Using the one which came with the unit. But, have seen them for sale on the web.
Even Saran Wrap might work....
My favorite solution is .. both! Seriously. But I'm using anhydrous isopropanol. The stuff you get at the store is usually 70%, so don't pour it onto the screen. Just dampen the cloth.Isopropyl alcohol? Micro-fiber cloth? Something else? It's for a XXL 540TM.
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