I don't take the coil off, just rinse the whole bottom assembly with body, mouthpiece and caps off it. Then blot the wick dry a bit and "wet-burn" it until coil glowing well again.
This will produce a good amount of ash and nastiness, so do the whole procedure one more time and it should be good to go.
You can let the wick dry completely then, but I just fill it up and start vaping again right away. A few blank hits at first, then it gets great again.
The wick will not burn during this procedure, but the juice gunk that has burnt into it over time will mostly burn off, leaving it a whitish shade again and renewed wicking capibilities.
This silica wick can handle very high temps, I make mine glow with a butane torch before installing it to remove any possible factory residue
and sometimes when cleaning if it looks in good shape, if i have time to take it apart.. Just brings it back to almost the original white.
All the cleaning and dryburning will fray the wick some over time though, but the 3mm stuff should last longer I would think.