I'm soaking my skull right now in 3% and have a large pot but if I have to fill it up with the peroxide and water I feel it would be too dilute. Can I just soak it in peroxide to bleach it and if so how long should I leave it in? The last peroxide session didn't get it as white as I would have like it. I know you can get the gel for medical purposes but all I can find is the 3% topical. I was thinking it may take several hours I am right?