I use 510's, and I cleaned mine out pretty frequently using a few different methods.. Blowing them out and leaving them battery end up overnight...hot water...baking soda/vinegar...
What I've found works best for me so far is to soak them in some kind of liquor overnight -- I've thus far used vodka, tequila, and rum, simply because that's what I had handy at the moment -- and then rinse them out with hot water, blow out the water, and let them dry. Then, instead of just wetting them with liquid whenever I'm ready to use them, I actually wet them again with water, hook them to a battery, and pretty much light it up and hold it until the coil glows cherry red with sizzle and no smoke coming off.. Takes a while.. The batteries sometimes get so hot that they're hard to hold onto down as far as the button..
That probably sounds harsh, but I've only had *1* atomizer really, truly die and go completely cold on me so far, and it was an underperformer to begin with.. The rest of them, once soaked in alcohol, rinsed, and then dry-burned are like brand-new again..
Oh, and my average atomizer will go through this process about once a week, depending.. I don't really have a rotation, so to speak...I just can't stand an atomizer that's not giving me throat hit, so I reach for one that's been through this process and start the cleaning process on the one I just unhooked, ASAP.. I might use the same two in rotation a couple times in a row each while they others sit waiting.. No preference, no set rotation, no FIFO/LIFO system...just grab a dry one, rewet it with water, dry burn it till it quits smoking, and then vape.. Each of my attys has been through this many times...and like I said, only one fatality so far.
I took the dead 510 atty apart, btw.. Both wires were still hooked up.. The coil was intact.. I have no clue why it died, but it did.. And FWIW, there's not a whole lot to a 510 atty, and a 510 coil is pretty stout.. I unraveled the coil on the dead one and had to pull *pretty hard* to get it to break.. I think you'd have to have one heck of a battery to burn it in half, provided it was manufactured correctly.. Even a fully charged 510 battery won't get it past *red* hot, which isn't really a problem..
Heck, just for giggles, I got one red hot and put a drop of cold water in the barrel just to see what would happen once.. Big loud sizzle, tiny cloud of steam...still using it. lol
All in all, I think an atty will take more abuse than we think they will..