Yes, most hand mixers have detachable parts (such as beaters and wings) that can be washed either in the dishwasher or by hand. Cleaning the mixer body usually requires a simple wipe down.
Can I use the hand mixer to knead dough?
Yes, if the mixer has special kneading attachments or can withstand the intensity of the dough. Some hand mixers come with special kneading attachments for this purpose.