Unbelievably, just discovered, four years after buying a car, that the
rear screen has a washer as well as wiper :-)

Problem is, the jet, which angles the water 90 degrees, is blocked.
Managed to clear a hole with a needle and very fine drill in pin vice,
but not enough to allow a jet of water through. A small drop comes
through, but nothing more. Unlikely to be scale as such, as this is a
very soft water area. Any thoughts on what I could soak the jet in, to
help? Put through the dishwasher last night, which softened the crud,
and currently sitting in a cup of hot water with a dash of washing
powder. Vinegar, perhaps?

--
Graeme