this is definitely not pregnancy related, however I am hoping some mamas have some advice lol I have…

this is definitely not pregnancy related, however I am hoping some mamas have some advice lol I have a wedding I am attending in 8 days, I am still nursing my daughter and I only have 1 white nursing tank to wear under something ( was thinking of an open tank vest thing).... my questionis, how can I get it back to white? (I've been wearing it off and on for almost 8 months lol) it says non chlorine bleach so I don't think I can bleach is..... I just don't want a dingy looking shirt, I want to look good as my husband is best man in the wedding.... help!!!!