>I have the same problem.  But after investigating how to fix the problem I
>decided it was best to leave alone.  In most cases I am interested in using
>the wiper to clear rain off the rear window, not to clean a dirty window.
>As far as I know, there is no way to activate the wiper without squirting
>window cleaner.   Hence I deactivated the window washer pump - problem fixed

It ought to be simple enough to do, and clear PVC hose should be fine as a
replacement (most likely the original is also PVC).

The Vanagon is aerodynamically designed to keep the back window cleaned. I
never needed my back wiper except to clear rain when stopped. The window
never collected dirt or wet-road spray.

This is where Japanese vans fall down... they all seem to filth their rear
windows up very quickly.

Andrew Grebneff
Dunedin, New Zealand
VW & mollusc nut
1984 VW Type 25 Caravelle (currently SVX engine; waiting for a Porsche trans)
1985 Mitsubishi Galant Sigma 2.0 (FWD), for sale
1986 CE80 Toyota Corolla 1.8DX diesel (extaxi)
1989 CE96 Toyota Corolla 1.8DX diesel wagon
1989 CT170 Toyota Corona Select 2.0 diesel (taxi)