What kind of Dawn soap to use?

i have a medium brown color hair, i am 21 and have been dying my hair brown since i was 12...its too expensive to go to a salon, and i cannot get it back to blonde or even a very light brown and i just heard about using Dawn dishwashing liquid soap to lighten your hair. what kind? the kind with bleach in it or no?? and how much to use? also i heard it helps with oily hair. my hair is healthy but it gets sooo oily very fast, like within a day and i dont know why...winter maybe? anyways...what type of dawn? and i dont actually have that hee at home at the moment, will Joy bleach alternative citrus burst flavored work?