Zaino makes a great leather cleaner and conditioner.

 

I use Lexol Cleaner and Lexol Conditioner. Separate bottles. I got them when I had my GTO, and they work great. Cleans the seats really well, and conditioner doesn't leave the seats shiny and greasy. Great stuff.

 

Tried Lexol on my red leather seats and it started taking the color off. Been using the Mequairs leather wipes since.

 

zaino leather conditioner seemed to take some color off my black leather seats, the cloth i used got dark

 

This stuff is fantastic. Use it on my wife's leather seats. Also on our leather couch. Works great.

Use the rejuvenator oil first if the leather is really old, dirty, or dried out.

 

Forget about the usual products suggested here. The best leather seat conditioner and cleaner are made by the famous British hide maker, Connolly. They make seats for Rolls Royce, Bentley, and up scale leather funitures. I use it for home and cars. You can order it from Amazon.