I have been using Dumonde Tech, a bicycle chain lube, with good results for a couple of years. The product goes on thin like oil and gets drawn in by capillary action, then it dries and leaves a plastic-like protective layer on the metal parts. It doesn't wash off and doesn't attract dirt and I wipe off excess anyway. I think I may try this lube also on the deployable rear spoiler mechanism's pivots.
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