The reason for washing rice is to remove any excess starch from the grains; it is the starch in the grain that gives the rice a sticky quality, so whether or not you need to wash it will depend on the type of rice you use and the recipe. Basmati rice needs to be washed before cooking in plenty of water. Stir the rice well then drain off the cloudy water. Repeat until the water that runs off the rice is clear. Risotto, on the other hand, needs starch to give a creamy texture to the finished dish so risotto rice should never be washed. All-purpose long-grain rice is processed and does not generally need washing, though it may need to be soaked if the cooking method in the recipe requires it.
** Asian Recipes