I soak a large wet towel (just soaked enough that it doesn't drip) and fold it over the entire screen top, and then cover the towel with foil to seal down the sides. That spikes the humidity WAY up. It lasts a few days. Just need to change it out every few days so that it doesn't develop bacteria.
I've been doing this since last June or something, but I've actually had zero issues with the screen top rusting like other people thought it would. It looks just the same as before.
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