title_body: Moka pot - oxidization, rust or mold?
upvoted_answer: You have mentioned that you've seen similar questions but... Did you see this one?
  
  What are these spots on the inside of my moka pot? Do I need to remove them?
  
  If yes, then I can help you with two things. First, rust is not possible as your moka pot is aluminum. Therefore, only aluminum oxide and mold are the two options left. Second, if you can remove it, it's mold. Otherwise, it's oxidation and does no harm.
  
  How to remove mold? Bleach is probably the easiest option of you really rinse well afterwards.