I want it to be dry so that I can grind it into powder. I've tried this before, but when I grind them, there are still quite a lot of remaining bits of the orange peels. Any suggestions of how to dry them quickly and what kitchen appliances I should use? I've tried using a blender (Magic Bullet) but it doesn't work. Should I try buying a coffee grinder and put the dry orange peels in there? If I do that, will it be completely powder? No bits remaining?