Nan, depending somewhat on the variety and how tight wrappers are, it can be easy enough to trim roots and strip off the dirty wrappers after about 6 weeks or fully cured, as the outer wrappers are looser then. It's also easy to strip to a clean wrapper immediately after harvest, by taking the bottom leaf that's still soft enough to pull off easily down to the bulb. IMO it is hardest to remove wrappers in the in between time, when neither fresh and soft nor fully cured.
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