Yea I read about the belt dressing. Since this is not an automotive environment it might work. I would never use it in a car. Bar soap seems to get good reviews.

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Tony H
W111 280SE 3.5 Coupe
Manual transmission

Past cars:
Porsche 914 2.0
'64 Jaguar XKE Roadster
'57 Oval Window VW
'71 Toyota Hilux Pickup Truck-Dad bought new
'73 Toyota Celica GT