You can go to Giant Stores, electronic sectin upstairs, and you will find a steam cleaner pot for 90/Riyals, this will oust all stains without spoiling the your pan in minutes, and tool can be used multy purpose even for ironing the cloth and it is hand and strongly built. This is the scientifc way of cleaning pot.

There is another idea is take some water and just boil it on the stove till stai gets loosened and using the sponge you can remove by the support of LUX liquid dish washer.

Any third methode if u use it, means you will spoil your
wonderfull pot and its original coating so dont do it baby. Good luck. and ask again for further technologies if you still need any.