Screen cleaning sprays
Overview
There are specialized cleaning sprays for screens which work very well on pen displays.
More here: Cleaning drawing tablets
What I use
I've used two screen cleaning sprays: WOOSH and MISTIFY. Both work well.
I spray the into a microfiber towel that comes with the bottle. I want the cloth damp (not wet). Then I wipe down the tablet screen.
Demonstration
Here's a good video showing WOOSH in use: https://www.youtube.com/watch?v=6zNUKkehnpc

WOOSH! bottle with its microfiber towel MISTIFY bottle with its microfiber towel
Pen tablets
These sprays also works on pen tablets, but the effects aren't especially dramatic.
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