How do I clean the thermostat screen without accidentally changing settings?

Press SCREEN to lock the display for cleaning; the screen will remain locked for 30 seconds so you can clean it without changing any settings. After 30 seconds, press DONE to resume normal operation, or press SCREEN again if you need more time. Do not spray any liquid directly on the thermostat — spray liquid onto a cloth first, then use the damp cloth with water or household glass cleaner, avoiding abrasive cleansers. (Page 44)