Not to scare you but a lot of heavy metals and toxic compounds just get squirreled away by the body in some fat or in the liver, appendix, or lymph nodes.
There are certain substances that 'chelate' those heavy metals. You can get tests that detect the amount of heavy metal in your body (not in your mind -- Metallica will still be lodged in your brain).
I think garlic is a natural chelation substance.
I learned about this via http://GrossmanWellness.Com/ (not a commercial, just a satisfied patient)