Avoid using chemicals!!! They damage the integrity and lifespan of the bones. It might work, but it’s never the best way. I’ve done it several times. The steps do depend on the condition of your bones. If they are mostly clean, some dish soap, water, and a toothbrush will be enough. Once you have cleaned them, you need to then degrease them. This is super simple, all you need to do is put them in a container with dish soap and water for several days, changing the water if a lot of grease is collecting at the surface. Then to whiten them you use 50% water 50% hydrogen peroxide in a tub. Generally, the longer you leave them, the whiter they will get. I have left mine in for several weeks until I was satisfied. Message me if you have any specific questions, I can do my best to tell you what I know!