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I agree with Bojan. The corrector can be cleaned using the dab dab dab method in the link. I favoured the isopropyl alchohol and distilled water mix but the action is the same as long it all goes back in exactly the same tape marked location.
Looks to me like condensation inside is your problem. Does it get cold at night outside for your scope in Darwin and how does a secondary move around?
The mirror makers use the straight alchohol and folded wipe edge to edge technique but this can only be done on a new or perfectly clean mirror or corrector with a small accidental smudge. Most of the contaminants in cleaning seem to come from the air or the existing surfaces, ideally all should be blown clean.
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