Teflon Dry Lube
Try liberal shots of Teflon Dry Lube (TDL) spray. It's not quite as slippery as the non-nutritious food shellac Clark Griswald sprays on his snow disc, but it’s very close.
The Teflon Dry Lube is very slippery, sprays on dry, and is not sticky, so it does not attract and accumulate dust/grime.
Seriously, this material is nothing to mess with from a health perspective. Make damn sure you wash your hands immediately after spraying, and even after handling the can. Do not breathe the fumes. This stuff will damage you; do not ingest it, nor breathe it.
I bought it at Office Max next to the End-Dust products. It is probably available at Ace Hardware and other hardware stores. Or, per the label, try blasterproducts.com.
It works on grandfather clocks' mechanisms, door locks, and intricate electrical mechanical devices (such as your Opel clock).