[representing]

I hope someone else ran into this problem and figured a solution.

One of my referee shirt, the primary one I wear, had lost its bright whiteness. I washed it with colors since I don't have many white articles of clothing, and because I needed it same day I was ref'ing, I put it in the dryer. When it came out, the white is now an off-white, but not quite gray. Has anyone come into this problem and/or know of a solution? I'm considering taking it to a dry cleaner to see if they could do anything, but would like to see if there is an easy at-home solution. I even tried just washing it again by itself and letting it air-dry, but that didn't work.