Most fabric pots are washable. So all that's needed is hosing them down and wash with as much water as you can. Ensure the holes and air spaces are thoroughly cleaned by eliminating every soil particle and dirt from the interior or exterior of the bag. After washing, simply spread inside out to have the water particles drip off the bag nicely under the sun. Reusing grow bags help you to save cost, but they have to be clean for proper storage.