sticky zipper

The zips on my boots are getting sticky. google says graphite, silicon spray or beeswax. if they were metal I'd use graphite but not sure on plastic. mixing them could get messy. anyone done something that has worked?
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Rossi wrote:Rub a candle up the zipper
the kid wrote:Rossi wrote:Rub a candle up the zipper
Thats similar advice that the Mother Superior gave all her young novices