If your grip tape is missing large sections and is no longer providing adequate traction, it should be changed. If it is dirty, you can use a grip tape cleaner bar like Grip Gum, which can be purchased from any skate shop or retailer.
With the Meepo boards, the grip tape can be replaced without the risk of damaging any wiring. Changing the grip tape is the same as changing the grip tape on any other non-electric skateboard. Have at it!