Try taking a VERY slightly dampened q-tip to the connector pieces, then use the dry end on it afterwards. I've had to do that to my SE215 once or twice, and they use the same connectors.
I'm just loving my UE900, it delivers my sound signature preference to all types of music that I've thrown at it. However, I am rather unhappy about the shorting out of sound in the right earbud! I have now tried the rotate, reconnect cable trick a few times and seems to have worked. I'll be unhappy if it comes back because that means these would have to go back for a replacement!!! What a shame for such a lovely pair of buds. Love them, SQ wise.
A question: has anyone tried to use this with HeadStage Arrow Amp? What's your conclusion/opinion? Many thanks for any feedback.