Green hair?!?

So I'm a lifeguard at my local pool and am required to be in the pool a lot. I have blonde hair and I came home one day to find that my hair was green. I went to Pinterest and tried some of the options they gave me (baking soda, ketchup, the ultra swim shampoo, and purple shampoo), but none of them have worked. I just want my green hair gone without having to pay a fortune to get it recolored. Any ideas on what to do?