Can baking soda or citric acid help clean a pot with burned-in milk rice? The other day I was cooking milk rice and forgot about it so it burned a little on the bottom. This lower layer was very hard to clean. A lot of websites recommend boiling water in the pot with baking soda (Sodium bicarbonate) or citric acid to dissolve the burned residue and make it easier to clean the pot. I tried this but it did not help. I doubt there is even a chemical reaction between these reagents that would help in any way.

Is this another myth or is there scientific basis for given recommendation?
The hotter the water, the more likely it will be to remove burnt-on starch. Not only does $\ce{NaHCO3}$ raise the boiling point of the water, but it also helps saponify fats (actually, "washing soda", $\ce{Na2CO3}$ would be better).

However, you still need to do a lot of scrubbing afterwards to remove the carbonized layer.