Dry cloth works best for cliff sensors.

Yes, just use a dry microfiber cloth.

Cliff sensors are optical IR sensors. They get dusty or smudged, which blocks the beam and makes your robot think there’s a drop-off everywhere. A gentle wipe with a dry microfiber cloth clears that right up.

Don’t use water, alcohol, or any cleaning spray. Moisture can seep into the sensor housing and cause shorts or fogging. Compressed air works if the dust is loose, but a cloth is more reliable for sticky grime.

Avoid cotton swabs — they can leave fibers. And never scratch at the sensor window. Just a light wipe.

Honestly, you probably don’t need to clean them more than once every couple months unless you live in a dust factory.