Step 4 literally says to scrub until all of the brown bits are gone. Look at the picture in step 5, does that look like anything is burnt onto it? I see nothing in that says anything about taste.
Also, wikiHow is a garbage source as anyone can submit anything they want. They don’t have to have any clue what they’re talking about.
Seasoning is not about taste. You’re just using a dirty pan if it has stuff burned onto it. Your pan should not be imparting any taste into your food.
https://www.wikihow.life/Clean-Your-Cast-Iron-Skillet-or-Pot-After-Daily-Use
Step 4 literally says to scrub until all of the brown bits are gone. Look at the picture in step 5, does that look like anything is burnt onto it? I see nothing in that says anything about taste.
Also, wikiHow is a garbage source as anyone can submit anything they want. They don’t have to have any clue what they’re talking about.
Here is cooks illustrated, a well respected cooking magazine that tests everything, talking cleaning.
And yes, they say soap is fine. If mild dish detergent is removing your seasoning, it wasn’t seasoned properly.