I had same problem and i bought RIT laundry treatment color remove you can buy in any grocery store.I got mine at walmart in laundry isle. it says only for white clothes but i had a yellow tank top, a yellow shirt with green lettering on it and a seagull also white shirt with blue lettering and i washed clothes first then washed again with RIT on hottest water. I can not believe it worked great. I did have to do it twice. but it works great. and i am so glad they were new shirts and from hollister and aero. you might not have to do it twice but i had a few other items i had to get blue dye out of.RIT also has other products for whiten whites and stain removing never tried them but after tring this i will try there other products.