Today is the first time I've listened to my ER-6s in the house, i.e. a relatively quiet environment (at least most of the time -- at any rate there's none of the general drone associated with the train). I have noticed that during the quiet parts of the music I can hear a kind of hissing sound...

As I am now the proud owner of a pair of ER-6s , I was wondering about how people care for these 'phones so as to maximize their lifespan. Any tips on cleaning the silicon earplugs? How about storage, since that little plastic case seems a lot of trouble to stuff the 'phones back into every time?

Looking for some purchasing advice for some sealed headphones for use while traveling and commuting: airplanes and trains, for the most part. (I will also use these in the library, so the noise isolation bit is crucial -- little or no leakage preferred.) Perhaps this is heresy, but the most...