I drain my Kanger Ego T2 CC clearos completely until i get a dry burn.
When i change juices i clean them by just running the wick and tank under warm tap water. Dry them with tissue paper, dry burn the wick, fill it up and it's clear to go again. Very easy and no hassle.
First time i wanted to clean the wick i took it out of the tube, but that was a bad idea. I couldn't get the coil to reconnect with the frame again, so i had to throw it away. Then again the wicks only cost about Euro1.95. It was a cheap lesson learned.