I've got a classic Nardi, bought new a couple of years ago. I normally use soapy water and a cloth to give it a wipe down when it gets a bit sticky. I was wondering if there's any specific products or ways to clean a leather wheel without damaging it.
Go to a countryside/equestrian store and buy some saddle soap that horsey types use for keeping tack clean. Much cheaper and better results than buying all that interior cleaning nonsense from halfrauds