Hi Victoria
As a cloth diapering mama I think I can offer some advice. First - don't use fabric softner! That will lessen the absorbancy! And scented sprays can be harsh on your baby's sensitive behind, both of these only cover the odor anyway not get rid of it.
I second the method of trying a squirt of blue Dawn dish detergent for a load of laundry. Although, Dawn supposedly doesn't work for front loading wash machines. Another method is to use baking soda (a few shakes)in the wash cycle and white vinegar (1 cup or less) in teh rinse as someone else suggested. Some also suggest using Tide detergent to get out the smells.
A GREAT resource is Stephanie at abbyslane.com. Her online store is local, in the Northern Virginia area, and she has lots of experience and good advice for wash routines with cloth diapers and cloth training pants. You should receive a good response about what works and doesn't work from her! She is a local expert regarding wash routines for cloth!!!
take care,
D.