If regular soap is taking off your seasoning, your pan isn't seasoned properly. If it's carbonized and can be removed with soap, it was heated far too high or too fast without first allowing it to polymerize. The goal is to polymerize it so it bonds to the iron.
If you go back and read what I said you will notice I said the soap strips off the oil. Later I said that this is needed to continually replenish the surface so that it can remain nonstick. Washing in soap occasionally is not likely to do harm but you will have a harder time if it is washed with soap often.
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