Place in a gallon zip-top bag with the remaining ingredients: orange juice, orange lest, lime juice, garlic, oregano, water, and salt.
Seal the bag after pressing out the extra air and squeeze it a few times to mix the brine.
Place in a pie plate (or other walled-dish to prevent a fridge disaster should your bag spring a leak) and refrigerate for at least 4 hours (I typically do it overnight).
Heat your grill to medium-high, remove chicken from marinade, and grill ~6 minutes on each side.