When I was using the ego T type A atomizers/tanks, I would rotate two atomizers. Once a week, I would swap them out. The one I had been using would then get cleaned using hot water, then isopropyl alcohol, and I would set it aside to dry. The rubbing alcohol is supposed to dry for at least 2-3 days, which was fine with me since I was going to let it sit for a week anyway.
I just rotated two atomizer once a week and that worked fine. Sooner or later, I'd have had to replace those, of course.
I ended up switching to the EMDCC's, and I like them better. Those, I'm not reusing. I use one for a week or so, then put a brand new one on. I tried cleaning them out, but my results after cleaning weren't very good, and I wasted a lot of fluid that way, so now I just move to a new one. I still clean the old ones, and I throw them into a "For emergency use only" box.