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Popeye,
I used to have an LX200 with UHT coatings, and like you, I was paranoid about avoiding cleaning the corrector plate if at all possible. When I took the scope to Bintel for a service after 18 months, I hadn't cleaned the corrector plate once. I recall how horrified Don Whiteman was.....he described it as filthy, but to my eyes it looked OK. I was less hesitant about cleaning it after that.
There is no great mystery to cleaning the corrector plate, the only thing of course is to avoid the cleaning fluid getting in through the edges to the inside of the scope. The Bintel snake oil works very well! As you seem well aware, care must be taken to avoid anything gritty being rubbed against the plate.
Good luck!
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