How can I remove semi-permanent hair dye?

how can I get out semi permanent hair dye in less than 10 hours

I have a question for you, if you're going to die your hair why don't you keep it thats the point isn't it? and whats with the weird time frame??? w.e... when I dyed my hair w/ manic panic I swam in chlorinated water and my color lowly faded after like a week of swiming
hope it helps ya
Marissa

Semi Permanent hair dye is NOT intended for long-term hair color. And as someone who works in the corporate world, but enjoys having fun every so often, there are MANY people who want to go a different color for just a few days/weeks.

Not everyone wants to have bubble-gum pink hair, or turquoise blue hair for years on end.

As for getting the dye out in 10 hours, you're kinda stuck - and I know that it's past the time you need this info, anyway. You need at least 24 shampooings, which can really damage your hair if you try them all in a row. Try to make sure you have a few days, at least, to remove the dye, and get a clarifying shampoo (the original neutragena shampoo should work well, but Rusk makes one, and a few others do, too). I've been told the more sun exposure the color gets, the faster it will fade, too.

Worst case - get a permanent hair dye that matches your original hair color as best you can, and dye over it. This doesn't ALWAYS work, but its a last-ditch effort, after all.