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Thanks for the responses. I managed to get some 100% Isopropyl alcohol from Bunnings, but it strangely leaves the same residue as the 'rubbing alcohol' variety.
Maybe I'm expecting too much, but I expect to see 100% completely clean glass (i.e. nothing visible at all when inspecting under lights) after carefully using cotton buds dampened with the stuff. Maybe the 'residue' I'm seeing (reminds me of an 'oil slick' effect) will not affect viewing with the eyepiece at all, but I haven't had a clear night since using it.
I'll try some of the other suggestions made.. thanks.
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