If the sensors are particularly dirty and a dry cloth isn’t helping, you could try using a slightly damp cloth to wipe down the sensors. However, this could potentially damage the sensors and void any warranty you have on your vacuum, so proceed with caution. [3] X Research source

Clean the other components of your Roborock on a regular basis too, like the dustbin, filter, wheels, and main brush.

The drop sensors will be slightly sunk into the plastic that’s covering the bottom of the vacuum. They’re each about 1 inch (2. 5 cm) long and they’re reflective. Different models of Roborock vacuums may have slightly different layouts. If you’re having a hard time locating any of the sensors, refer to the owner’s manual or look up a diagram of your specific model online.