Transfer the dough back into the bowl and allow it to rest for 10 minutes, then completely fill the bowl with water to submerge the dough ball.
Allow it to rest for at least 30 minutes.
Washing the flour
Once the resting time elapses, begin kneading the dough in the bowl underwater.
It will start releasing its starches and the water should become white and thicken slightly (almost cream-like!).
Knead the dough for 2-3 minutes, then discard the starchy water, pour in fresh water, and repeat.
Your dough should require about 3 washes in total and the water should not be as thick and more see-through in the end. It's normal for the dough to almost fall apart in this washing process. Don't worry - it will come back together in the next step.
Discard the water and place the seitan dough into a big colander.
Rinse it under running water for 10 seconds, then set it aside for 30 minutes to rest.