The first thing to do is to look at what detergent you are using. Does it have plant oils in it? Are you using the recommended amount? Always use the recommended amount of detergent according to its package directions...always! Rinse your night time diapers well in the morning and squeeze all excess water out before adding to your diaper pail. Propping open the diaper pail to allow air circulation is also recommended, especially during the summer months.
If the above doesn't work, you most likely have a case of ammonia build up in your diapers. Our Mighty Bubbles Laundry Treatment works great for an occasional diaper deep clean. Usually three treatments will be enough to get the diapers back to their normal state again. If they still smell after three treatments, try another 1 or 2 treatments and follow up with a mild bleach wash to disinfect the ammonia bacteria. Use ¼ cup for a HE front load washer on a warm wash, extra rinse and ½ cup if you are using a top load washer. Going forward, make sure you are using a good detergent and enough of it. Check out our Laundry section for more information located in our Learn tab at the top of our website. You should never need to deep clean your Hybrid shells with Mighty Bubbles. The shells are water-resistant and non absorbent.