1. Clean it up using tooth brush.
2. Turn it up side down (not necessary).
3. Your right hand, access from back, your four fingers on its belly, your thumb under its cover (between cover and legs). In this position, its four legs are in the middle of your thumb and index finger.
4. Your left hand, holding the sharp corner of the same side where your right hand is, force it open. Now, your left hand holds the cover, and your right hand holds the body.
5. It will take 10 seconds to get one done.
I should post a picture to make it more clear but please imagine it.
2. Turn it up side down (not necessary).
3. Your right hand, access from back, your four fingers on its belly, your thumb under its cover (between cover and legs). In this position, its four legs are in the middle of your thumb and index finger.
4. Your left hand, holding the sharp corner of the same side where your right hand is, force it open. Now, your left hand holds the cover, and your right hand holds the body.
5. It will take 10 seconds to get one done.
I should post a picture to make it more clear but please imagine it.