DIAGNOSIS The glossy plastic display and glass lens are prone to smudges from skin oils. Using improper cleaners can damage the anti-glare coating.
FIX Power off the system at the breaker for safety. Remove the Nest display from the base. Use a dry, soft microfiber cloth to gently wipe the screen. For stubborn marks, slightly dampen the cloth with distilled water only.
IF THAT DIDN'T WORK For grease, use a 50/50 mix of distilled white vinegar and distilled water on the microfiber cloth. Wipe gently. Immediately dry the screen and the metal ring with a second dry microfiber cloth.
HEADS UP Never use window cleaners, isopropyl alcohol, ammonia-based products, or paper towels. These will permanently haze or scratch the display lens. Avoid getting moisture in the charging port on the back.