white shirts are now grey

this is my first time doing laundry in korea and i accidentally washed all of my white shirts i need for work with a black sweater and now they’re all grey and one of them has purpleish stains on it ? i can’t even order anything since i don’t have my ARC so i have to rely on the daiso across the street from my apartment and possibly emart? 

i bought bleach from daiso and soaked it in bleach since yesterday and i don’t think it helped much ? maybe because i waited 2 something hours to soak them? (they were still wet though). 

Please help me fix it or else i’ll have very limited clothes to wear to work !! i also live in daejeon if that’s helpful