Instructions
Remove the silicone Wii Remote jacket by first pulling the bottom end of the remote out the back of the rubber enclosure and then sliding the rest off the top. Though the jacket does not directly get in the way of the strap tie, taking it off makes the process easier.
Disconnect any attached peripherals such as the Nunchuk. First unhook the wrist strap tie from the peripheral's connector hook, then pull the cable connector out while holding in the release tabs on the side.
Loosen the knot holding the wrist strap on by pulling at one string in the knot's center. If you can't get it started, try sticking a pin or the end of a paper clip through the knot and wiggling it loose.
Pull the knotted end of the loop out to create a large enough space to fit the wrist strap through. Place it through this gap and pull it to detach the strap from the controller.