Dry Lubricant with PTFE is your friend. It doesn’t attract and hold dirt, dust, or road grime. Clean the threaded rods on the jacks with a wire brush and spray with dry lube. Or just replace them like Wavery said. There aren’t really any line points in the lift system, but it doesn’t hurt to shoot some dry lube where the lift arms meet the pivot pins up in the pockets. Never stick your fingers up in there, just the spray can straw.
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