Hey,
Check out my thread I need to pass a hair test in 12 days...it has pretty much everything you need to do.

basically...
dont smoke any more...
step 1 bleach your hair wash it out with ultra clear made by zydot...do that process up to 3x then along the way you may want to do the mac method as well...which is a mix of vinegar with clean and clear astringent orange bottle...it has 2% salcylic acid...rub it in for 8-10 minutes wash it out with tide laundry detergent. you probably want to buy some aloe rid by nexxus to use as well...dont condition your hair

the day of the test mac your hair then zydot your hair 2x as reccomended on the package..this is my plan. I only did 1 bleaching because I have already met with the company and they know my hair color so i cant afford to have the salon redye my hair again. I needed a perfect match because my employers know what my hair looks like.