Drying out breast milk question?

Danielle • Married to my best friend. Jason Tyler born 04-14-17 @ 2:48 am
Ive been drying out my milk with cabbage and a tight bra since monday. The only times im not doing it is when taking a shower so ive got the cabbage on me pretty much all the time. How long do i need to do this for it to go away? This cabbage is making my boobs itchy lol