stevenstevensteven , look in your CD...
Barring that, the front wheel sensors have a cable running off the back of them through the wheel well to the engine compartment. On my car there are two cables per wheel - one for the brake pad wear sensor, the other is the ABS sensor.
If you want to clean the pickups that the sensor reads, I think that you will have to remove the hub/rotor, as the ribs that the sensor reads are on the engine side of the hub.
To clean the face of the sensor itself, you can either remove the hub/rotor or remove the sensor from the steering knuckle. While not hard, this is more than a 30 second job.
seeya around town...
84 300TD - 235k - Farbe "Surfblau" bought at 213k
87 300SDL - 131k - Farbe "PimpGold" bought at 115k
00 Klepper Faltboot Expedition Double