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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.
The effectiveness of a hearing protection earplug or earmuff is specified by a Noise Reduction Rating (NRR). The typical range for hearing protection is from 15 to 35 decibels of sound attenuation. The higher the NRR is, the more noise attenuation it provides, as long as it is also a good fit in the ear.