Boulder has had almost 3 inches of rain which makes it challenging to harvest garlic. However, it's best to dig it up in spite of the mud. After you dig it up, you can rinse the bulb part in a tub of water to get off some of the mud. Then spread it out in the shade to dry. Make sure they are spread out well enough to dry out. After a few days you can condense it into bundles to keep drying.
In a couple of weeks you can rub off the outside layer of dirt and mud to clean it up.
Every leaf on the garlic represents one layer of bulb skin, so if you leave them in the ground too long they'll deteriorate quickly and won't store long or look appealing- although they'll be fine to eat.