Glove cleanins

I have a set of Mechanix gloves that have gotten oil on them. They have been like this for a couple months and are still wet with the oil. Is there any proper way to clean these gloves without damaging them? I was thinking about hand washing them, but I don't know if that will damage the leather or the plumbing because of the oil.

i put mine in the washing machine. isn't there a tag on them that tells you about washing?

at the end of the day I stick mine into a pail of floor dry.

I don't use the Mechanix gloves anymore for that reason - the material absorbs everything and won't get clean. Ansell gloves are much better. This is where I buy mine: safetyprodirect.com