Rinse rice until the water runs mostly clear
Soak the rice in water for several hours or overnight
Drain the rice completely
Blend the soaked rice with fresh water until smooth
Strain the batter through a fine sieve or cloth
Add salt if desired
Heat a steamer or prepare a thin steaming tray
Pour a thin layer of batter into the tray
Steam until the rice sheet is set
Remove the cooked rice sheet and cool slightly
Brush with oil to prevent sticking
Cut into noodle strips
Repeat with the remaining batter
Use immediately or store covered to keep from drying out