Tailgate/Rear wash/wipe has a blockage

I traced the pipework back to just in front of the rear wheels, cut the pipe and blew down it towards the rear. This part is not blocked, but going towards the front the pipework vanishes behind the panelling. Has anyone dealt with this problem before? I fitted two new water pumps, but still no water coming through. There is such a maze of tubes around the two pumps that it's difficult to access and route which of the pumps is for the rear. Any suggestions would be very welcome.
 
I would try to find the pump for the front first. Then I would blow air down the tube of the one going to the back. Hope this helps.
 
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