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How to clean a penny board
Use a 13 mm socket to remove the wheels.
Use a socket wrench with a 13 mm socket to remove the nuts that hold each wheel to its truck. Between each nut and wheel will be a small washer.
Another washer will be between the wheel and the body of the truck. Take care not to lose these small parts Skate tools will usually feature a 13 mm socket, as well as the other sizes you will need to disassemble a penny board.