If you feel like your whites aren't clean unless they come out smelling faintly of swimming pool, then you'll be happy to know that a little old lemon is a great bleach alternative. Not to mention, it smells a lot better.
The citric acid in lemons helps to break down stains and get those dingy whites back to bright. And unlike bleach, lemon juice is safe for colors, too. Just add one cup of lemon juice to your load of wash along with your usual detergent.