I found a post saying it's pretty common advice on most forums that the preseasoning layer should be removed? Is it true?
Here's the link:
"You have a brand new cast iron skillet from the factory. Modern cast iron skillets have a layer of gick on it that the manufacturer has decided to label as "seasoning". I suspect that the stuff on that cast iron skillet has a lot more to do with marketing, shipping and profit margins than what you or I would want to eat. I think you really want to get that gick off. It's pretty common advice on the forums that you should get that gick off."
Personally, I think that's a very difficult process. If I have to remove the preseasoning, I'd rather buy unseasoned cast iron, but it's very difficult to buy nowadays , though.