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| p.1 #2 · Rubber focus 'ring' is drying out on my 35L, tips to moisten it? |
First tip is to use a soft toothbrush and gently scrub it with plain water. That will remove dried salts from sweat, and some oxidation.
Then wipe it with a cloth moistened with a small amount of 303. Don't use much; you can apply more "coats" if needed, but it's hard to remove too much.