To clean the external eyelid prior to irrigation, moisten a gauze with irrigation solution and wipe from the inner to the outer canthus.
The best technique to clean the external eyelid prior to irrigation is option B: Moisten a gauze with irrigation solution and wipe from the inner to the outer canthus. This method ensures effective cleaning by moving from the inner to the outer part of the eyelid without risking contamination.
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