My main gloves are Condor tactical, leather with hard knuckles. I've used them pretty regularly for about a year-and-a-half now. They've become a little, well, funktacular. I went online and found the below guide to cleaning leather gloves.
Without further ado:
How To Wash Leather Gloves
By: Jeannine Mancini
Break Studios Contributing Writer
To ensure the quality of leather gloves, you will need to know how to properly care for them and how to wash leather gloves. Cleaning the gloves will keep them in excellent condition. By washing leather, you are preventing dirt and oil from becoming embedded in the leather. Be sure to only wash gloves that are labeled "washable".
In order to wash leather gloves, you will need:
Lukewarm water
cotton cloth or towel
Moisturizing soap if leather is finished
Saddlesoap if leather is unfinished
Leather conditioner or Mink oil
1. Place gloves on your hands. It is easiest to wash gloves when they are on. This will fill the gloves and allow you to get into the crevices.
2. To begin cleaning your leather gloves, use the cloth or towel to dust off the leather.
3. If the leather is finished, you can lightly dampen part of the cloth. Apply a small amount of the moisturizing soap. Rub cloth to form a lather. When selecting a moisturizing soap, try a natural brand for best results. If the leather is unfinished, apply saddlesoap to the cloth, instead.
4. Gently blot the soap into the leather. Avoid rubbing. You can use a soft brush to buff away stubborn spots.
5. Once gloves appear clean, you can remove them.
6. Next, wet the remaining part of the towel. Wipe off all soaps suds.
7. Allow gloves to air dry.
8. Once gloves have thoroughly dried, you can apply a leather conditioner to the finished leather, or mink oil to the unfinished leather. Avoid a thick, greasy leather conditioner. A top-rated brand is Leather Honey.
9. After you have cleaned your leather gloves, you are going to want to keep them looking great. Remember to store them in a cool, dry place. Avoid any exposure to moisture. When storing gloves, lay them flat with tissue paper or leather between them. Avoid placing anything on top of the leather gloves, in order to prevent creasing.
Reference:
http://ladiesleathergloves.net/caring-for-ladies-leather-gloves