How do I fix my skateboard wheels?

my skateboard wheels have formed like a bunch of black stuff on it that slows the board down... its not grease or anything heres a pic i found off of another persons question... is there any way i can get this off.. and dont tell me to buy a complete or something like that... im just a kid with no money and wants... show more my skateboard wheels have formed like a bunch of black stuff on it that slows the board down... its not grease or anything
heres a pic i found off of another persons question... is there any way i can get this off.. and dont tell me to buy a complete or something like that... im just a kid with no money and wants to skate without buying a board... and i already asked my friends if i could have thier old ones

http://i242.photobucket.com/albums/ff158...
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