I'm not sure I'm doing this right but have switched flavors with my 2 nautilus tanks several times. I've only been at this 3 weeks for full disclosure.
I try to plan on vaping it way down, like below .5 ml or a dump the leftovers back in the bottle. I rinse everything in hot water, taking it apart into 3 pieces (base, atomizer head, and tank). Sometimes I've soaked other times not. My soak has been some white vinegar and water. Other recommendations are Grain alcohol or 100 proof vodka. I've been letting soak a couple hours then rinse in hot water again. Make sure you get it all dry before re-assembling (shake and let sit for 12 plus hours, shake and blow, hair drier, fan, etc). assemble, fill, and vape on. Well after filling let it sit a bit to wick, or primer puffs, and I've tried a drop of ejuice on the coil before assembly too.
I've been having wicking / dry hit problems with my nautilus heads though. Sounds common. At 3ish bux each this is ridiculous. prolly something I'm doing wrong above. Sometimes I'll get a dry / burnt tasting hit and I have to cover the air hole and suck to get it to wick good again. Im not vaping that hi, 7-8 watts.
Look forward to hearing other recommendations.