Micra screenwash gummed up

Don't bother getting it out. This isn't specific to a micra, but you can probably get at the pump behind an arch liner or under the bumper. Pull the pump off the bottom, put bleach in the top (it'll most likely be algae in the tank due to no screenwash being used, bleach kills it, you need bugger all), and hose it out.

Something similar happens on my Astra after using screen wash/anti-freeze - the water here is very hard. The Astra too has its washer filter sited low down, behind the wheel arch and I'd prefer not to disturb the arch cover etc. I've found that backflushing with mains water into the pipe supplying the washer nozzle flushes the debris out of the wash bottle. (Getting at the pipe is a matter of pulling the rubber sealing strip off the ridge along the scuttle(?), and feeling underneath the support sheet.) You need a good fit between your garden hose and the washer pipe but aquarists do a range of sizes of plastic tubing, and some PVC tape seals the gap. Whole operation took about 30 minutes.

=============================== Have you checked the state of the water jets? These often get blocked and can be cleared with a bristle pulled from a wire brush. Better still buy a set of gas welding nozzle cleaners like these:

Cic.

Been there, done that. It's actually faster to take the bumper off, and access it that way.

However, it can be done.

is a picture of the removed tank. In this position, the car is pointing to the right, and you would be facing the drivers side front wheel if it was installed.

The tank sits just behind the corner of the bumper, above the wheel arch. The two lower fixings can be gotten to with a ring spanner (with the aid of much swearing) from the underside, after loosening the fixings, several of which will break off as you attempt to remove them.

The upper one is accessible - sort of - going in from the top, from a line along the radiator, under the headlight.

It's faster to remove the bumper. You will break several of the plastic clips. In mu case I diddn't bother sourcing new ones, but took a bag of M5 stainless steel countersink scrmachine screws, with lock nuts and washers, and made my own. Take stainless steel screw, and grind two flats on the shank., to accept a 4mm or so spanner.

Now, put the screw into the blind side of the fixing, with a washer, and from the bottom, grab the top part of the thread with a spanner or pliers, and thread on by hand the nut. When the nut hits the spanner/pliers, move down to the bottom, and continue to tighten.

These worked really well.

Is this the rear screenwash? If so, I found that it wasn't that at all. It was the little bearing in the one-way valve that sits inside the tailgate (deeply stupid design - I relocated it to where it's accessible if it fails) that had corroded shut somehow. Taking it apart and putting together made it work. The pump is reversible, and there are one way valves in the output nozzles to select which is active.

It's the front. Thanks for all the tips chaps.