The stains found on the stainless steel pot is normal. To remove the stains, you can do following:
• Use a damp cloth with white vinegar to wipe off the stain
• Use a non-abrasive sponge with a mix dishwashing soap and baking soda to remove the stain
• Pour 200 ml of white vinegar and 200ml water. After, press the Sauté button and let it boil for 20 mins. Let it sit overnight. Rinse the pot and wipe dry
• Use a stainless steel cream to wipe the pot sparkling clean and rinse thoroughly