A few observations/suggestions:
When removing from the bag, place skillet directly into the sink and scrub with hot water, dishwashing detergent, and a Stainless Steel Scrubby, not a vinegar soak yet.
It is not necessary to neutralize the 'lye', as it is water soluble.
If all the seasoning is not removed, re-spray, back in the bag, for more soak time.
(oven cleaner method can take up to one week or longer).
Repeat scrub.
50/50 Vinegar solution if needed to remove RUST, checking every 30 minutes. Final scrub using cold water only...
:)