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You should only need to clean the primary about once a year if not longer.
You should never shine a torch onto a primary surface it just makes you want to clean them, it shows up every little speck and makes it a whole lot worse than what it really is. It will take a fair amount of dust and grime on the surface to warrant the need of a cleaning, I know of one guy who had never washed his mirror in over 8 years, and it still looked fine. That is also dependant on what atmospheric conditions are around too...smoke etc...
Another South Aussie too hey, WELCOME!!!!
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