From Wikipedia,
Those aren’t things you want in your bearings. Just because something is ‘safe to use’ doesn’t make it a good idea to use. Draino isn’t a solvent. It’s a caustic liquid designed to cut through hair and soap. Do you have hair or soap in your bearing? I sure hope not. Just use one of the products already recommended. Mineral Spirits, Lighter fluid, or gasoline in a pinch will all work.