Hi Zander. I had a similar problem with my 12 inch mirror. I set about doing a warm clean. Mostly oil from aircraft passing overhead, diesel smoke, gum tree haze accumulate onto a mirrors surface as well as dust, etc. I dust off the mirror with a blower, then soak it in warm water for about 5 minutes. Rinse off the mirror in warm water, clean and rinse the sink then refill. I have the water temp at around 25 C.then add a tspn of baby shampoo diluted in a glass of water.. (Oil dissolves better in warm water.) I let it soak for a few minutes then use cotton wool. I then raise the mirror out of the water and spray the surface with iso. I then soak it again, drain off the water and refill with warm water, baby shampoo, soak again, cotton wool clean then rinse in warm water and gradually reduce the temp till it's room temp for a few minutes. Final rinse with demineralized water. Then, whatever's left on the mirror, stays there till next time. Hope this helps. Cheers!
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