poster paint on kids football shirts help needed

kal25

As the title says, in the midst of trying to keep my two boys occupied I sent them outside I setup the patio table and let them paint some stones with poster paint. Like an idiot I did not think about changing their tshirts. However I didn't think it would be too much trouble to get out,yeah right. I have tried to put them in hot soapy water with bio powder and it has not shifted at all. I have tried to put on warm wash in washing machine with soda crystals, again to no avail. I am now pulling my hair out as my mum will kill me if she sees the state of them as she brought them about 4 months ago. Please guys you are normally really good at this, save me from an earbending from my mother! Thanks in advance.