Lexol is great! They sell a seperate cleaner, and conditioner. Do not use Windex, or any other cleaner with Ammonia.
A bottle of Lexol should cost you less than $10, and will last a long while.

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+1 for the Lexol. Use the cleaner first then follow with the conditioner. That will keep the leather flexible enough to resist cracking and tears.

 

Another vote here for Lexol - it is a separate Cleaner and Conditioner that works and smells very good. However I have checked out Justin's Leather stuff at a show a couple weeks ago and I will probably give it a try next season after my supply of Lexol runs out.

 

I usually just use Meguiar's and it works really well.