If there are not a large number, people can clean roots of fresh Drumstick mushroom and soak in light salt brine for 15 to 15 minutes, then ladle out and drain off excess moisture. This method can retain freshness of one week.
If there are major quantities, people can firstly give them a thorough airing, then put them into nonferrous containers and make overlay storage with salt. This method can store above one year.