lay the shirt flat on a table and pinch it in the middle. twist that shit clockwise and once its fully twisted put rubber bands around it. put some bleach in a spray bottle with as fine of a mist as possible. spray the shirt with enough to get it damp, but not soaked through. remove the rubberbands, untwist, rinse it in a bucket of cold water, wash it by itself.
there might be a better way to do it but thats what i did and it looks just like the pic.