What is the best way to clean your leather jacket?Should you use any type of conditioner on it?
Leather is animal skin. It has pores and they get dirty, the leather will also dry out and eventually crack.
My (late) father used to make high end leather products by hand....... Wallets, belts, purses, bowling bags, saddles, etc. He taught me to use saddle soap, gently using an old towel or wash cloth, and in some cases a very soft, natural bristle brush. Wiping it clean and dry with another terry cloth towel..... all cotton.
To treat the leather and but some moisture back in, we used Lexol or a like product that contains lanolin......Just read the directions. Lexol also makes a cleaning product that works pretty damned well.
I use this same method on leather interiors, chaps, furniture, fine shoes (then shoe polish) and any high quality leather products.
What ever you do NEVER, EVER use Armor All or any other like product on any leather. THey are all petroleum based products with some degree of silicone. These will only server to dry up the hide and ruin it. Mink oil will make some leather water resistant, but it will also attack cotton threads........... have a pair of deerskin gloves that are coming apart because of this.