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plain old ATF works just fine for the PS.

If the rear washer doesn't work, it's most likely the check valve in the back or the rear nozzle. Have someone put their hand by the rear pump (it's on the top of the reservoir, right near where the filler neck goes in) With the car off, you should hear/feel the pump run when you press the button.

When you say wire looms, are you referring to the coiled sheath over the wiring? Visible in this pic...

damaged in this pic where it goes to the alarm horn...

It's pretty rare for the wiring coating to deteriorate. If you do mean the sheath, you can buy it at autoparts stores.
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