Well, I washed my son’s white undershirts with one of my RED shirt, which is just dumb, but that red shirt wasn’t even new. So now white undershirts are kind of “pink”. I soaked them in bleach, it didn’t do a thing, still pink!
What else can I try besides just give up and buy new white undershirts?
You might have to soak in oxygenated bleach and water for 8 hrs or more.
RIT color remover stove top method may work.
If you threw them in the dryer you probably set the stain in.
Try an oxygen/peroxide based bleach.
Sometimes white vinegar mixed with warm water will work. (1 tbsp in 1 qt water) Soak for an hour. Rinse well and repeatedly. Be aware that vinegar can permanently damage/weaken cotton and linen fabrics
If all else fails, try Rit Color Remover.
Or buy him new tees. Then buy a tie dye kit and have fun making tops.
If they are 100% cotton, you could try and dye them white with Rit Dye. We have some whites undershirts that are now pale, pale green in our rag bin.
You need to use RIT dye remover…comes in a little box by the RIT dye.
Bleach isn’t the answer for removing dye
Will try RIT dye remover! I feel stupid thinking bleach can whiten everything!!!
Thanks.
I have two thoughts.
First, I bet if you put the red shirts in bleach or if bleach splashed on the shirts, it would have taken the dye out! Have had it happen several times.
Second, no disrespect intended, but they are undershirts. Just buy new ones.
Undershirts are to be worn UNDER other shirts. No one will see them.
Don’t feel stupid! this is a learn by disaster sort of thing. 
Use the hottest water setting for the material. If these are 100% cotton, the you can use the hottest water setting.
Pick up an extra box to have on hand for future boo boos. It’s always best to treat asap.
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First, I bet if you put the red shirts in bleach or if bleach splashed on the shirts, it would have taken the dye out! Have had it happen several times.
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True, but that would be undiluted bleach…and when that happens, often the bleached area is now bleach damaged and a hole will soon be there. I’ve had that happen to a T shirt or two…and soon after, the threads rip.
What kind of bleach are you using? I’m surprised washing in CHLORINE bleach didn’t take care of it right away, especially if the shirts are 100% cotton.
Last I checked…the RIT stuff cost close to $10. A pack of new T shirts can’t possibly cost all that much.
@morrismm, no worry about disrespect, I was thinking of just buying new shirts, but really wanted to find out why chlorine bleach does not work, so I know for future reference.
@thumper1, once I get to check price of RIT stuff, I probably will end up buying a pack of new undershirt instead, but having the RIT on hand may not be a bad idea in the event I mess up something else in the future! 
@GMTplus7, precisely, that’s what I told my son, they are worn under other shirts, as long as the collar does not stick out of the other shirt, no one can see it! I did use chlorine bleach, undershirts are 100% cotton.
Come to think if it, maybe he’s afraid of a “hot date” seeing it.
Actually, this is a teachable moment, for S to take over washing his OWN clothing so he can prevent these incidents. My S was motivated to start washing his own clothes in grade school because I didn’t scrub at the red dirt spots with soap and they became permanent stains. He scrubbed them out and had unstinted clothing. D was and is lazier and likes using “color catchers” to keep her clothing the colors they’re supposed to be. I learned about color catchers on CC. They’re in the laundry section and online.
Be thankful it was only some cheaply replaced undershirts.
Before he went off to school, S1 had never used a top load washing machine. The first load of laundry he did there, he trashed a dryer by mistaking it for a front loading washer. He poured liquid detergent in there w his stinky clothes and turned it on.
At my Walmart, it’s about $3 a box.
at some, it’s even cheaper $1.77
If you wash them several times in the regular laundry, they will fade back to white… Or whitish…