Once you season cast iron you can clean it however you want. Even with soap. The oils you bake on there at such high heat causes polymerization.
You don’t have to continue to season cast iron after cleaning it, unless you’re cleaning it with a fucking angle grinder.
I don’t believe in it, and I’ll never go, but my girlfriend does.
Yes, she has to keep going back, but when they “pop” the correct thing, she’s pain free for weeks. When she holds off going, she’s in pain and can’t sleep until she goes.
I personally don’t trust them, and it’s a lot of money for temporary relief, but I guess it kinda works? As long as you’re fine with the trade-off being fucking paralyzed when they crank your neck at the speed of sound.