Polishing knobs.
Trying to clean the knobs on my CR100 (I've got 5, I love them) having tried a buffing wheel, T cut and several polishes, a friend gave me (I had better not name it) a car polish with PTFE containing camauba wax and being nonabrasive. Unbelievably the knobs actually looked like new. Good for paint work as well, try it and see.
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