I see what you are referring to. I have a bit of dust above my end and send keys. I suppose if you really wanted to clean it, you could run a needle through it and pull some dust out.
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If there really is some kind of sticky substance there, then it really should only be a problem removing dust the first time. After that I would think it would be easily removable with a keyboard spray type cleaner
No, I think what the dude says before is right - When I scratched it out a stick dirty like came out of it. There's prob some sort of adhesive there. I cleared most of it out late in the evening yesterday and it's pretty clear now