Hey there...I got around to getting rid of my roots last week. I decided to go blonde for the summer, and I was pretty successful. There is a tiny bit of pink in there still, but mostly it's platinum blonde. I've gotten some compliments on it. A few people wanted to know kept some of the pink "on purpose".
I used Basic White bleach from Sally's and 30 volume developer. I did use it all over my hair, but applied to the roots initially and then pulled through. I will have to be careful in the future, though, since I am trying to grow my hair out into a China doll type bob. Patience and conditioner!!!