Hello, I've been using my shure e4's for about 6months. But for some reason the right earplug starts to ''crackle'' after about 5mins of play... sometimes its instantly and sometimes it doesnt have this problem.. any1 know what might be causing this? I've cleaned them, so filth shouldn't...

hi! My shure e2's hard plastic sleeves turned from clear to yellow brownish.. after intensive use. Water + Soap doesn't seem to bring back their old shine. Now i'm wondering if bleach could do the trick? or would that destroy them?