I use detergent with every other load (about 2/3 the recommended
amount), and alternate with washing soda. Works fine.
In one of the places I lived, the chlorine content of the tap water was
so high you could smell it, and I stopped adding bleach for whites, and
for colors, I read that most of the large detergent makers add a
chemical that neutralizes it. So I would let the washer fill up without
clothes, only the detergent and water, and let it sit for 1/2 hour
before adding the clothes. The fading of the colors went away.-Jitney