Big Silver 1

I have a 2002 Galaxy 1.9TD Ghia, just reading some of the postings and found others have had the same problem with the rear washer connection coming undone under the passenger footwell ! Resolved now not sure if there is any water damage to the control unit. The non clicking sensor is the drivers side front, how the chuff do you get at that baby to swap out? Also anyone any success on buying the spares? Any help much appreciated.