I have seen several members mention using color catchers. I found this at Hancocks and it has worked quite well. It is a towel-like piece of fabric that started out white. I just finished using my first (good for 30 loads & comes with a count tracker) and it is really ugly now. I picked them up when Hancocks had notions 1/2 price, for a little over $2. Not bad to get 30 uses out of it. It even took out color that had bled in some flannel.
Back side with counter
Front of box