I have never used the W/S washer in 15 years, but I did change the fluid because I thought that was the problem with the "low fluid" message, that did not correct the problem.
I think I will just dis connect (open) the circuit and see if that removes the message.

 

OK, some updates on "her" Jag
I had to drive her car for awhile and the warning kept coming on with every start but I could clear it.
So today I was under the car for maintaince and remembered this post. so I just dis connected the plug on the bottom of the bottle and the "Open Circuit" cleared the dash warning Low Fluid.
We have never used the washer so I doubt I will ever run out of fluid!

 

The low washer fluid light stays on in my 1997 xk8. Could it also be the sensor?