how do i clean the nest e screen? it's got fingerprints and smudges and my shirt just makes it worse

Diagnosis

The Nest Thermostat E features a frosted plastic lens rather than the polished glass found on the Nest Learning Thermostat. This matte finish is designed to reduce glare, but it creates a microscopic texture that traps skin oils, airborne grease, and dust particles. When you use a dry shirt or a standard paper towel, you aren't removing the oils; you are simply spreading them across the surface and pushing debris deeper into the frosted texture, which creates those stubborn, cloudy streaks. Furthermore, using abrasive fabrics or dry rubbing can create static electricity on the plastic housing. This static charge acts like a magnet for household dust, meaning the screen often looks dirtier just minutes after you've attempted to wipe it. To confirm you have oil buildup rather than a scratch, run a finger across the smudge; if it smears or feels "tacky," it is a lipid-based residue that requires a chemical surfactant to break the bond between the oil and the frosted plastic.

How to Fix It

To properly clean the display without scratching the plastic or risking a short circuit in the base, follow these precise steps:

1. Gently grip the outer ring of the Nest E display and pull it straight toward you, away from the wall. The display pops off the base plate easily. Do not twist or pry; a direct pull is all that is required.
2. Prepare a cleaning solution. Avoid ammonia-based glass cleaners (like Windex) as they can strip the frosting or cause the plastic to yellow over time. Instead, use a mixture of 70% Isopropyl alcohol and distilled water (1:1 ratio) or a dedicated electronics cleaning spray.
3. Dampen a high-density microfiber cloth (the kind used for eyeglasses). Do not spray the liquid directly onto the thermostat screen, as liquid can seep behind the bezel and damage the internal LCD driver.
4. Apply light, circular motions to the smudged areas. Do not press hard; the frosted plastic is softer than glass and can develop "burnish marks" (shiny spots) if scrubbed too aggressively.
5. Using a second, completely dry microfiber cloth, gently buff the screen in a clockwise motion to remove any remaining streaks.
6. Once the screen is dry and clear, align the display with the base and press firmly until it clicks back into place.

If That Didn't Work

• Stubborn Grease Spots: If you have kitchen grease on the unit, use a tiny drop of mild dish soap (like Dawn) on a damp cotton swab. Gently dab the spot, then wipe it away with a damp cloth. The soap emulsifies the grease that alcohol sometimes misses.
• Micro-Dust Trapped in Texture: If the screen looks "grainy" despite cleaning, use a can of compressed air. Hold the can 6 inches away and blow across the screen to clear the microscopic pits of the frosted plastic before wiping.
• Deep Scratches: If the "smudge" is actually a physical scratch in the plastic, cleaning will not fix it. Avoid using polishing compounds or toothpaste, as these will remove the frosted finish and leave a permanent, glossy "bald spot" on your display.
• Clouding/Hazing: If the screen appears foggy, it may be a buildup of residue from previous cleaning products. Use a 70% Isopropyl alcohol wipe (medical grade) to strip the old residue, followed immediately by a distilled water wipe.

Heads Up

• Avoid Paper Products: Never use paper towels, napkins, or toilet tissue. These are made of wood pulp and act like sandpaper on the soft plastic of the Nest E, creating permanent micro-scratches.
• Chemical Warning: Never use bleach, acetone, or nail polish remover. These solvents will chemically melt the plastic housing and permanently ruin the frosted aesthetic.
• Moisture Control: Always ensure the display is fully dry before snapping it back onto the base to prevent moisture from bridging the electrical pins.
• Handling: To prevent future smudges, avoid touching the screen during temperature adjustments; instead, use the outer rotating ring to navigate menus.