I use RTAs a lot more than I did when I started. These days, it isn't really worth it to me to clean store bought heads (although I used to). For me, a good rinse under almost scalding water, then sitting in water overnight (I would've used distilled, but we have a huge water filter under our house, as our water was terrible) then rinsing again and air drying was my method. I stopped doing it as I use more RTAs, and although I still enjoy some rebuildable tanks, my replacement of store bought heads has gone WAY down. I don't rinse and reuse anymore, merely because coil life death happens kind of unpredictably the second go round. Sometimes I'd get a few days, sometimes less, and it just became not worth it. I do save (hoard) used coil heads, in case I can't obtain certain ones in the future....
It's also a very self-sufficient way of vaping. Making coils and using rayon is inexpensive, and once you learn how to do it (it's a learning curve, but a worthwhile one) you don't have to rely on manufacturers to provide coil heads.
The rebuildable atomizer system forum would be a great place to start to learn more about doing it. Best of luck,
Anna