When we hear about "ways" of other states/countries, we definitely are surprised and shocked. The point is how much are we ready to accept it and not derogate the same. There is always a ratio of oil to rice that is to be followed while mixing them. It doesnt mean that oil would be dripping from it. Castor oil(aamudam, in telugu) is an effective moth/germ repellant and hence used while storing. The same storage containers would be used as we do in our areas; those aluminium/steel containers. Very effective, I must say. Remember, this whole process is done when storing in quintals not merely 10-15kgs. And as far as washing before cooking is concerned, they are washed the same way as we do for regular rice/dals. Only, it could take a few more mins to rinse off the oil. But usually, that is not of much concern, coz castor oil is edible. And in fact, produces heat to the body, which is acceptable for the cold weathers there. And wheat being the staple food of Gujarat, rice is prepared in very little quantities every day. There could be few items like khichidi, that is prepared regularly, yet the rice intake is very less compared to our 4 southern Indian states. So, they have, devised this technique to store rice/dal for a longer period of time. The jute bags that are used to store, have their own shelf life too. But the bags are not moth repellants.