I agree with your grease choice for the wipers Bob, and moreso in the arctic conditions experienced in this neck of the woods. I use Dow corning 55 o-ring lubricant. It will fill and seal any scrapes in the wiper housing while at the same time staying pliable even when freezing. I use the same grease on the M-series trailer plugs.
It was always standard to find a mud wasp nest in the little tube leading from the wiper motors.
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