Just a few simple steps to cleaning a clearo.
When it's new, or after vaping a while.... well, I like to clean all my new ones, as I'm not willing to bet that the factory either cleaned them or was sterile. Hey, it's a factory!
Take it completely apart - tip, tube, base, Head (atomizer/coil/wick combo). Don't need to separate those, it's one unit unless you want to rewind your own coil.
Clean all the parts. I usually just rinse under a lot of hot running water. With the head, just pat it dry, don't wipe it, as the wick will probably fray and become unusable. Let dry or not. If you don't it will just take a few draws to vaporize the water out, giving a bland vape for a little bit.
After some time in use - it varies quite a bit based on juice composition and viscosity, vaping power, and probably some other things as well - the coil will start to get covered in what is generally called "gunk." A dry burn can be used to burn this off - use the search bar above, there are many discussions on this technique. Basically, you apply power to the coil in bursts, heating it enough to start to burn off the gunk, but in short bursts of power, say 3 - 5 seconds, so you don't burn the coil out. The clean the head again, and let dry (or not). The gunk adversely affect the heat transfer from the coil to the juice, so when it's thick enough, no or poor vape. Dry burning can extend their service life. Eventually, the wicks will fall apart.
Then again, heads can be pretty cheap. Many choose to just put in a new one. User choice. I tend to have several heads for each of my toppers, and when the wicks start to go, I'll clean and set them aside, waiting until I have enough to make it worthwhile getting out the wire, wick &cetera.