"They just don't make 'em like they used to." I've said it many times about certain things and HEARD it even more. NOT TRUE though, when it comes to leather. It's good stuff! You'll have to give it some TLC every now and then but if you take the time to do this, your leather goods will last and last . . . and last . . . and last. It's worth your time, trust me.
>> THESE INSTRUCTIONS ARE NOT MEANT FOR SUEDE <<
Let's start with CLEANING a leather belt.
Keeping in mind that you don't want to saturate the leather, take a lukewarm damp cloth and wipe off any grime or sweat. Back & front. More than once is fine, if necessary.
For heavy dirt you may want to use a cleaner like Saddle Soap. Remember that soaps are high alkaline which can darken leather and damage it if used too often. Either way, after cleaning, let it air dry. The dry time is important. DO NOT apply heat to quicken this step. Just...wait. Some hours or even overnight is great.
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Now it's time to CONDITION the leather.
You should only apply a leather conditioner to cleaned leather. Conditioners contain moisture & important ingredients that will help to protect the leather and deter dirt. Your belt will be less likely to dry out and crack if conditioned (like say, 1-2 times a year or more if heavily used). If you used Saddle Soap to clean your belt, that's actually a conditioner too so you're good to go. If you cleaned it with warm water, once dry, apply leather conditioner or oil to a dry cloth and rub it all over the belt, both sides. Just follow the directions on the container.
Recommended products are Mink Oil Paste, or Aussie Leather Conditioner, or Snow Proof, or Neatsfoot Oil, or Mink Oil.
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IMPORTANT - don't store your leather in plastic, ever. If you're not actually using your leather, storing it in a fabric bag is best. Keeping it away from heat, humidity & sunlight is key. To prevent mold, air your leather every few weeks or so.