i'am having the regular showers also wen the girlfriend/passenger
accedently presses the button when removed there are 2 holes on each side and here in belgium they even have to work when the car is
inspected every year

grtz

 

Why not simply plug the end that feeds the headlight washers? Remove the line that feeds it, crimp or in some way block the end.

When you need to pass inspection, undo, reconnect and drive.