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Answers. Best Answer: It's fine to reuse ear plugs as long as you clean your ears each time before inserting them. You'll need to replace them occasionally, depending on how often they're used. I've found that the yellow cylindrical ones work better and stay clean longer than the standard orange ones.
If the earplugs are being used in a moist and/or dirty environment, be sure the hands and ears are clean and dry before applying or re-inserting the earplugs or a proper seal may not be achieved. A sign that you have achieved a proper seal is that your own voice will sound more internal and exaggerated.