title_body: How can I clean my these spots on my aluminium moka pot?
upvoted_answer: That looks very much like aluminum oxide, caused by exposure of aluminum to oxygen in the air. Don't worry. However unsightly it looks, it's not dangerous. You should be able to remove it with white vinegar or a solution of vinegar in water. Wet a soft cloth or soft-bristled brush with it and gently scrub.