Being designed for off-roading, your ATV gloves are very likely to get extremely dirty. Not to mention that the added adrenaline-induced sweating can create a particularly unpleasant odor! As such, it’s likely you’ll need to clean you gloves fairly regularly to maintain their materials.
The most important thing, with any pair of riding gloves, is to closely follow the manufacturers guidelines. You may find some pairs of gloves are absolutely fine when it comes to popping them in the washing machine, but this is pretty rare thanks to the reinforced palms and knuckles, which come with different materials. If you can do this, pop them on the right cycle, which will likely be a cold wash and gentle rinse. Otherwise, give them a simple hand-wash.
Drying is usually the more painful part, as they can take a while to become dry enough to comfortably use again. Never put your ATV gloves in the dryer, as the materials are not often suited to this and your gloves can become damaged or lose their shape. Instead, simply hang them out the dry or pop them on your radiator- keeping them as flat as possible, so you don’t bunch up any of the fabrics or synthetics.