I have acidic fingers and my strings wear out rather quickly. I am using Elixir which is a lot better than most other brands, but after around two weeks it loses the clean sound, becomes hard (or impossible) to tune perfectly, no matter how much I clean it after playing. I also use this thing on the strings before&after playing:

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It does seem to help a bit, but not much. Is there something I can apply to my fingers or the strings to mitigate the acidity of my skin? Or any other practice which helps?

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