: How can I clean these brown iron stains in my pot? I use a big aluminium pot to boil water. I think the water contains iron because after 4-6 months, the inside of the pot is full of brown stains. The colour is just like

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It's hard to say what is causing these stains without more information about exactly how you are using the pot. If you are just using it to boil water and nothing else, then the stains could be a result of the minerals in the water in your area. Also, if you are just using the pot for water, do you wash the pot in between uses? Repeated exposure to moisture can cause an oxidation layer to form on the surface of the metal. Cleaning the pan thoroughly between each use should help prevent oxide buildup.

The stains could also be caused by what you are using to clean the pot. Aluminum is a fairly reactive metal; so any acidic compound or residue that gets left on the material for too long is likely to cause a stain. You can read more about how to take care of your aluminum cookware here:
www.jesrestaurantequipment.com/jesrestaurantequipmentblog/cleaning-aluminum-cookware/

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If it's rust stains or other kinds of scale build up, CLR will take care of it:
www.jelmar.com/CLRbasic.htm
From the pictures (thanks for adding) it looks like sediment from the water (source, pipes, etc) and CLR cleans it easily. Just don't breath the fumes.

Also, you can try commercial coffee pot cleaners such as www.urnex.com/ to remove the build up.

Finally, if none of the above is available in your area, try Vinegar first. If that didn't work, wash off and switch to baking soda. you may have to make a paste and let it treat for a while.

There is also this recipe for cleaning rust stains from aluminum pots, though I haven't tried it.