For plain canvas bag, you could add some salt or white vinegar into water when you first wash which could prevent fading. Before cleaning, remove the accessories.

Then, let the bag soak in water for about 30 minutes. Wash it with clean water.

If there are stains, you have to clean the stains at first. Add some detergent on it, and then brush it. Then, you could settle to clean the whole bag. After cleaning, turn the inside out and let it dry in cool place.
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