Simplified the screenwash system on the E30 because it didn't work properly and it had started leaking from a few places.
The car was optioned with intensive wash / headlight wash-wipe, which means there are two reservoirs under the bonnet, one for the windscreen, and one for the headlights.
The headlight reservoir has its own pump, and the windscreen reservoir has two pumps, one for regular washes, and a supplemental one for "intensive wash".
There are two hoses that go up the bonnet to the washer nozzles, one from each pump. The hoses each go via a check valve, into a T check valve, then each output goes to a T piece where they rejoin, and the output from those go to the washer jets.
Then theres a hose that goes along the flitch tray to the headlights via a check valve and a T and another check valve...
And theres a control module for the intensive wash, and a couple of sensors.
The rear screenwash is its own entity with its own reservoir and pump in the boot. So originally it has four washer pumps and three washer reservoirs...
The headlight wash/wipe system didn't work on my car, and I never used the intensive wash (half the point of it was the headlight wash anyway) so I removed the headlight wash pump, the supplementary pump, all the check valves and T pieces, the control module, and half a mile of hose, and chucked it all in a box. Other than the pipe which went in the bin.
It now has, one functional reservoir with one pump, one pipe that goes up the bonnet via a check valve to a T piece that goes to the washer jets.
Thats it... And it works better than it ever has...