I have to say, I'm in two minds about this story. On the one hand, every Euro a Neo-Nazi spends on prank t-shirts is one less he has to buy his Playmobil Pogromnacht Playset, or whatever. On the other, I'm not sure we're going to make the world a better place by discouraging ultra-right lunatics from washing their clothes. Or I we hoping the stench would function as some kind of early warning system?
Either way, if you're going to put all that effort into making T-shirts that change after the first wash, you should try to be a little bit more imaginative about it. How about:
That last one might be a bit tricky to get to work, actually...