General question for the Spheroid users... How long do you generally run a wick & coil before changing it? When the wick starts to look gunky, I've had success with rinsing the wick and coil in water (still attached to the base), blowing out the excess water, dry burning the remaining water out and then gently using an old toothbrush to clean any burnt juice gunk off the coil. This seems to make it almost like new, and so far, I've been happily using the same wick & coil for over three weeks! Thoughts? Feedback? Thanks! 