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Windex is available in Oz, but distilled water and isopropil should also do the job (try and see - if it doesn't work, try with dish washing detergent and water).
As to orientation of corrector plate - I do not know, and IMO it should not matter (but it also doesn't hurt to original position, if possible).
Secondary mirror holder should not rotate - it is supposed to have a pin that prevents rotation of secondary assembly in its seat (which is fixed to colimation plate). Perhaps you mistook the mirror holder with screw-on retaining ring that keeps secondary mirror holder (with colimation mechanism) in it's seat?
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