I have had my C710's for quite awhile now. Around 3 years. The right side mess is completed covered in a small layer of wax, the left side is still mostly clear aside from a few small patches. The mesh isn't the hard metal kind like on my cheapies. Its more of a fabric type something that is moveable if you poke at it.
I just did a listening test and the left side is louder than the right, I do not notice at all when they are both in, but it personally bothers me.
Any ideas on how to clean these? Is it even possible? Or maybe replace the mesh?"