http://www.bialetti.com/coffee/stovetop/moka-express-c-1_7_22.html
moka express
Before First Use
1.Remove all labels and packaging.
2.Hand wash all parts with warm water.
3.Rinse all parts thoroughly to remove any soap residue.
4.Make 2-3 pots of coffee to season the pot. Follow to use instructions below for each cycle.

この説明の三番からすると二番で洗剤を使っているように読める
上の人が参考にしてる説明書は簡易のものなんじゃないかな