Not on purpose!!!
There are times when I forget to clean out my back pocket, head home and throw my clothes into the washer and don't realize that my glove is still in my pants.
It usually has to get tossed out as it becomes quite slimey after it runs through the washer.
Mondo, If perchance you do run one thru the washer, place it on a dry towel, and cover the glove with the towel. The glove will take a couple of days to dry down and then use leather conditioner/cleaner on it and it will be restored. I've done this myself and it seems to work well for me. The golve should be a little damp to the touch when you put the conditioner on it and then let it air dry for a day or two.