How do I clean the thermostat screen?
Press SCREEN to lock the screen for cleaning for 30 seconds so you can clean without changing any settings. Do not spray liquid directly on the thermostat; instead, spray liquid onto a cloth and then use the damp cloth to clean the screen. Use water or household glass cleaner and avoid abrasive cleansers.
From the official Honeywell RET97B5D100 Home Programmable Thermostat manual, page 44
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