The problem with brightly colored tshirts is that they tend to look worn and faded after only a couple of washes. Fortunately, there are some free and inexpensive ways to keep your bright pink shirt looking like new, without much fuss.
First, always wash bright t-shirts inside out. That way, the general wear and tear caused by the washing machine and dryer will occur on the inside of the shirt, where no one will ever see it!
Second, throw in a couple tablespoons of salt in with the laundry. This also helps keep colors bright and prevent fading.