Bleach Design Shirt I tried out the bleach pen trick for shirt design and it worked! The shirts for my 5k team turned out awesome and it was very easy to do. Materials needed: contact paper, t shirt and bleach pen.Wash the shirt at least once prior to doing this. Cut out your design on contact paper or stencil.(shown here is a Cricut cut my friend made)Apply the bleach pen lightly to the areas that you want to be bleached. Let sit for 8-10 minutes then rinse it off. Make sure to get all of the bleach off the shirt! My friends used this on black shirts and used a black sharpie marker to fix the edges around the design.