Having recently done this, I just pulled the spray nozzles out, pulled a bit of tubing out, and left the nozzles attached.  Worked perfectly. After paint, I replaced with the 2-spray nozzle versions that GoWesty sells, and popped them back in with a wee bit of silicone sealant behind the gaskets.

Keith Hughes
'86 Westy GenV (Marvin)
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 Date:    Tue, 25 Jul 2017
 07:42:52 -0700
 From:    John Goubeaux <jlgoubeaux59@GMAIL.COM>
 Subject: Paint preparation tips...
 
 Can someone offer a suggestion on a
 good way to Not loose the ends of the
 wiper fluid tubes inside the dash,
 after removing the spray nozzles in
 preparation  for a paint job ?
 
 Thanks.  - john