The leather from which you have gloves made are Czech goat and lamb, I do not recommend washing them as described below.

Recommendation:
• grease stain – the crushed chalk can be applied to the stain overnight, then wiped with a dry cloth, it can be removed through the suction paper and iron (depending on how long the stain is on the gloves)

• common wear – definitely not to clean with gasoline and other aggressive substances, or not to massage with Vaseline, lard or indulon. There are already quite functional skin cleaners that you can get in shops, except they are not designed directly for gloves. I'm rehearsing, too, all the time.

• I do not recommend soaking the gloves completely, but gently using warm soap water and allowing them to dry freely.

• lining – so it doesn't fight. But there are already dry cleanings, sprays. If someone has excessive sweatiness, let them dry properly. If they get soaked also let it dry freely – not for heating, but somewhere loosely thrown, then put on your hands and move.

More for maintenance common.
Just game gloves, chamois, they're work, but you don't, they're natural light gloves, deer soap and lukewarm water and let it dry again. Wring

Tips for treating leather gloves (not completely tested) 

Wash the leather gloves in full-fat boiling milk, in which dissolve the slightly sliced soap or use soap flakes. Add whipped white and 20 drops of ammonia. We put the gloves on our hands and wash the way we wash our hands. Then we take them off and dry them between two towels. Not eating!!! We inflate gloves and dry in draughts.

We wash gloves of natural deer with special care to preserve their elasticity and softness. Put them on your hands and wash in a soapy or detergent solution warm 25-40 °C. We rub the dirtier areas with a cotton wool swab saturated with soap solution and then swing the gloves in water as warm as a washing bath. Dry as before.

Dried and shrunken leather objects - satchels, coats, gloves, etc. We rub with a clean cloth soaked in castor oil. Faded and scraped areas are blackened before painting on the skin and left to dry properly.

Remove the mould from the leather objects by first wiping it with fine Vaseline and then treating it with aerosol impregnation on the skin. Orange peel was good at polishing leather objects.