Had this issue myself last year. Bottom line: you gotta change the sensor.
Don't have to drop the entire washer fluid jug though, just unscrew the most visible mounting bolt to give you the clearance you need to extract the old sensor. You cannot get it out without doing that. I got the sensor out and in ONCE without removing the jug mount bolt, and fiddled with it for an hour before I said f that, and started to remove the entire jug. Didn't have to. Was an easy 10 minute job once I got that out of the way.
Be prepared to be washed with windshield washing fluid.