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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.
Using store-bought foam earplugs that don't fit your ear perfectly can also irritate the skin, another cause of infection, so if you only use them every so often, it's best to invest in a custom-molded pair. These will fit your ears like a glove, and reduce the risk of being pushed in too far.