In a large saucepan or Dutch oven, heat olive oil over medium-low heat. Cook leeks, celery and garlic until softened, about 2 minutes, stirring occasionally. Stir in russet potatoes. Add broth and bring mixture to boiling. Reduce heat; cover and simmer until potatoes are very tender, about 15 minutes. Remove from heat. Cool slightly.
Hy-Vee Test
KitchenTo clean leeks, trim them, then slit them lengthwise about a third of the way through. You can then open the leaves and wash away dirt from between the layers under cold running water.