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Hi Jonathon
I got a replacement and then proceeded to experiment with my fogged unit. I threw all sorts of things at it, including acetone and nothing shifted it. Until.......I struck the solution using a product called CLR from Bunnings. Gently unscrew the retaining ring. Careful not to slip off the recessed hole. once screwed off, soak for 30 seconds in CLR and then gently wipe with soft cloth or cotton pad moistened in CLR. Recommend you wear latex gloves. The filters will become as good as new in about a minute. There is no coating on the filter to destroy so no need to worry.
Pics for removal attached. And example of one bad unit that was cleaned to new.
Ted
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