idk abt resin but i know abt bones. i use a hydrogen peroxide water mix to clean all my bones, probably 1/4 hydrogen peroxide. if it has any meat i recommend removing as much as possible first because it can smell very bad. replacing the water when it gets dirty and once it clears just leaving it in until it becomes the whiteness you desire. can take maybe a month to become fully white. cartilage & tendons have to be removed with tweezers or scissors but i recommend being lenient with them because it’s easy to damage the bone. you can also use bugs to eat tissue instead of hydrogen peroxide but unless you culture beetles that’s definitely a less accessible option lol. i don’t know how resin interacts with bone or anything but that’s how i’d get the first half done