Your course of action will depend on how advanced the infestation is and how far you are from your vet. If the larvae are small and still few in number, you can hurry to the veterinary hospital. If the larvae are large and numerous, you have little time. Rinsing them off is very difficult, but I have removed them by completely submerging the trunk in a tub of water. It requires about three tub refills, followed by careful drying.
Wet fur provides an environment for more eggs to hatch.
Avoid dampening any more area than necessary. My veterinarians prefer a completely dry technique for maggot removal and pluck them by hand or tweezers. Most of their clients are too squeamish to do this. Chemicals strong enough to destroy the maggots are often too toxic to apply to a bunny in shock. If you are successful at removing the maggots yourself, you will still need to get your bunny checked by a veterinarian, as treatment may be necessary for shock or toxins.