Cleaning Nest Protect Gen 1 Smoke Detector 

Actually that is false. The official instructions state: support.google.com/googlenest/answer/9254377 6. Use a can of dry, compressed air-the kind used to clean computer keyboards. Move the air from one corner of the battery cover to the other, with a sweeping motion. 7. Make sure to blow into the smoke chamber, the large circle in the middle of your Nest Protect. Carefully blow air the entire way around. Don't try to remove the smoke chamber itself.