Hi Pat! Your sourdough starter container does not need to be washed every time you feed so long as the sides are clean and you are not seeing any indications of spoilage.  If you have starter building up on the sides of your container,  that dried out starter can fall into the mixture, creating undissolved bits of flour that can leave an unpleasant texture.  One tip is to take a small spatula and wipe the sides clean before storing the starter. That can help prevent buildup. When I see dried bits accumulating, I use that as an indication that it is time for me to clean the container. 

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