Stupid question, I know. But I tried cleaning some of the parts of my Sennheiser HD650 and only afterwards did I realize it might have been a stupid move.
I wiped down the headphone plug with rubbing alcohol, then I did the same with the detachment points. If you're familiar with the 650's, then you'll know you can detach the headphones from the cable. The I used rubbing alcohol on both the plugs on the cable side as well as the jacks on the headphone side.
I'm worried that might have degraded the sound and I can't exactly tell if the sound has changed or not. I might be paranoid and think it degraded but it might not have....
Anyone got any input? Thank you.