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I have not been cleaning for that long - but i think methanol works pretty good as it usually evaporates & doesn't leave much of a streak. Apart from a lens cleaning cloth, Kimiwipes are a no-lint optical cleaning tissue which works well with the methanol. I have also used a commercial cleaning solution from astronomy online - with provided cotton buds & it performed ok, and I think it is probably a preferred option. You cold try one of the big camera retailers for their lens cleaners - some of them are acceptable
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