The filter used in PRO's custom earplugs contains a patented precision membrane that treats the sound entering the ear canal. The filter can maintain its functionality even when it is wet with rain or sweat, and it can be rinsed the water to clean. You must not use a high-pressure water jet or air from pressured air gun or canister to clean the filter.

For general cleaning after use, rinse with cold water and gently rub the earplugs between your fingers, avoiding rinsing the filter directly, then dry with a paper towel leave it air dry.

If the outside of the earplug feels too oily, rub the lather between your thumb and forefinger with a tiny amount of mild soap and gently clean the outside of the PRO custom earplug, rinse off suds with cold water without rinsing the filter directly. Dry with a paper towel leave it air dry.

The earplug's audio duct must remain clean and clear to achieve the desired effect. All PRO custom earplugs come with an easy-to-use ear wax cleaning wand, which can pull out the ear wax stuck near the canal tip opening of the earplug. In the unlikely event that the ear wax gets too deep into the sound guide tube and fails to come out, remove the filter and rinse the audio duct with water.