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Finally I guess that anyway, if you get rid of the stains, you'll have to re-season a bit. Vinegar and baking soda works well, so thanks @RISwampYankee! And oh yes! thank you for pointing that the (hard-)water is guilty, I will wipe my pan more carefully for now on.
No, it couldn't hurt, no. I did it. The white stains did go away, and my seasoning too. I was wondering why does the rinse water was becoming black... But, my seasoning was not completely ruined, when I saw that my pan was sticking, I decided to follow your advice (the fresh coat of oil and the oven), and it finally sticked less. I cooked a one-piece omelette, so not so bad... Fortunatly, my guest was not so hungry (although I realized later in the evening that finally she was). I've maybe done something wrong (too much vinegar, not enough baking soda maybe?).
it's true that there is a lot of limestone in the water... But why white stains didn't appear before? Baking soda and vinegar seems quite hard, you think I will not break my seasoning? I know that acid is good for limestone, but why baking soda?
@canardgras so you suggest to break my seasoning and my heart? Like I said I will do it if mandatory... You don't think as GdD said that a bit of washing will not break the seasoning?
Let's speak about taste. It's safe for the taste to eat it cold (in a pasta salad). If you really want to eat it hot, you may do a cheesy pasta gratin, it's quick, easy and tasty.
