WD40 is what I would have used also. One thing you might consider the next time you need to apply it on a zipper or snap is to use a syringe as the applicator. If the syringe has a small needle then all the better to control exactly where the oil goes. As a second thought, for an alternative to WD40, I might have used a silicone based lube also using the syringe to apply it.
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Diesel Duck
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