Disconnecting the orange wire wil solve the problem without affecting the waterpump of the washer.
The sensor is actually a tube with a floating magnet in it.
When the magnet lowers (because not enough water), it wil connect a reed contact (a magnetic contact)
The thing is, that some window washing products have a degreaser in it, so the magnet can not move smoothly anymore, and stays stuck in the bottom part of the tube.
Repairing is not an option, i took one apart, but was never able of getting it assembled again...
Come to think to it, it's a rather expensive part, if i remember correctly.
If you take the top of, the wire's inside will snap.
Bottomside can not be opened.