Let me state you some tips on how to maintain and clean properly your hearing aids: br First, we must use appropriate tools such as pick and brush. This are used to remove earwax build up that may block or clog the microphone or receiver that may result into feedback. Next is to use gels or sprays to avoid undesirable moisture on your hearing aid. Lastly is cleaning up your hearing aid after use. But always remember to avoid using chemicals such as alcohol or wipes.