Intermittent wiper fluid pump squirting

[aknapper]

87 DG WBX Komet high top - Anyone have a problem getting the wiper fluid pump to spray?  The pump works fine - just removed it and tested it.  No blockages in the lines or nozzles.  It does not automatically squirt when I pull back the wiper lever.  Definitely no spray if the wipers are not on but is very intermittent and I have to jiggle and ease the lever back and forth til I hear the pump working...
I've had the van for 10 years now and it's this year that the intermittent spraying seems to have developed.  I can only think that there is an issue on the steering column.  Any thoughts?   Going in for the MOT tomorrow and this is my only concern...   thanks Andrew

[Aidan]

worth giving the contacts on the wiper stalk a spray with contact cleaner- maybe a spider egg sack been laid in there

[aknapper]

my VW mechanic thought alone similar lines when I told him when I brought the van in for it's MOT on friday.  He'd obv done some tightening up on the stalk as it is now crisp on squirting.  Job sorted!