Use compressed air for robot vacuum cliff sensors.

Yes, you can clean them easily. Those cliff sensors are just optical sensors — a little dust or hair confuses them into thinking there’s a drop-off where there isn’t.

Grab a can of compressed air or a dry microfiber cloth. Blow or wipe gently across the sensor openings (usually on the bottom edge). Don’t use water, alcohol, or any liquid — that can mess with the optics or seep inside. If compressed air doesn’t cut it, a dry cotton swab works too.

If the problem persists after cleaning, you might have a sensor that’s physically blocked by debris stuck deeper, or the sensor itself is failing. But nine times out of ten, a quick dusting fixes it.

Just don’t soak anything.