Once the bulbs are harvested, they need to be cleaned before going to curing. Caked soil can retain moisture and cause the bulb to rot prematurely. The dirt will stain through multiple layers of wrappers, permanently lowering the visual appeal, so it is important to clean the bulb immediately after harvesting.
If you will be curing in temperature-controlled storage or live in a dry climate, it is possible to wash the bulb with water to clean. However, if you will curing outdoors in the humid south, it is usually better to keep the bulb as dry as possible.
To clean a bulb without washing, grasp the lowest green leaf on the stalk and pull off, exposing a clean wrapper layer on the bulb. Do not remove more leaves (layers of bulb wrappers) than necessary.
Cut the roots off with a sharp knife or scissors. Roots harbor dirt and pathogens, as well as absorb moisture from the atmosphere and hinder curing.