Clean your Sontro OTC Hearing Aids with a clean, dry cloth. Do not use any liquids on your hearing aids as this can cause damage. Instead, brush excess wax away with the brush included inside your black zipper case.. We recommend changing your ear domes every 3-6 months or sooner, depending on wear and tear.  Refer to the User Manual for specific instructions.  Your Sontro OTC Hearing Aids have small electrical components inside them. Avoid getting them wet,  leaving them in extreme temperatures, and dropping your hearing aids.