How about putting some kind of cheap plastic material like the plastic cardboard stuff or similar in areas that are not visible? Lately I have been using sign board (unknown plastic material) in areas where I get lots of water like the stand top edge. Makes cleanup much faster/easier.
I don't think the humidity is a big problem but any kind of splashing will cause the drywall to swell. I had a problem with small air bubbles breaking on the water surface causing salt creep near drywall.
Does the drywall used in shower areas contain anti bacterial chemicals?
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