i use my graphics lead ejector pencil, very thin lead and i just rub it in each slot, it crumbles really easily and then poop the strings back in. does the same job bit you don't have to mess with a knife neer your guitar
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Current gear: Gutted and refitted Epiphone '58 Korina Flying V custom light finish, Marshall JCM900 SL-X head
Buckle Rash: Dude, just stop polishing 
R.I.P Phillip Burkinshaw
15/8/1945 - ?/8/2009
64 years old and still a rocker.
Paul....Where the hell is that guy half the time!?!!