Bought a Ikea Vardagen cast iron pan. Based on the manual, there's a protective coating that I need to remove first before seasoning.

So I just wash it with soap and sponge for a few times, and it came out with uneven colour as in the picture below.

[attachmentid=10978516]

Does it means that the darker shade part is still with the coating and needed to be removed until all is clear like the lighter shade side? Then might need to use the stainless steel wool or Scotch pad to scrub it off.

Thanks