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Well, a couple of weeks later and I'm all sorted. I rinsed the mirrors again under the tap and finished off with distilled water only. While I was at it I also laminated the dob base with ebony star #50, greased the focuser with white lithium grease and flocked behind the focuser. Still got to replace the stock teflon though.
Looking at Jupiter tonight was wicked! At 150x (8mm TV Plossl) I could get good focus and see 4 bands with some detail in between. My best views of this planet yet.
On a side note, I read a few comments on cloudy nights about the same issue I was having and it was mentioned that there seemed to be a bit of water in the atmosphere at that time. Beyond my understanding, but I thought it worth the mention.
Thanks heaps for all your suggestions!
Cheers
Simon
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