Months and months ago I noticed that our cloth diapers just reeked of ammonia after they were peed in. Let me assure you that, if you are nearly knocked out when you dump your dirty diapers into the washing machine, you have ammonia build up. It may just initially smell bad, but, if left untreated, this build up will LITERALLY BURN your baby’s bum. I had never heard of this being a possibility! So, if you have stinky diapers, this post is for you. And, if you plan on using cloth then you need to know the signs of ammonia build up.
After a diaper has been peed in, it should just smell lightly of urine. If it smells of ammonia, then it’s time to start treating the diapers. How do you treat diapers for ammonia build up? I found a couple great websites that were full of helpful info! The first is Pooters and the second is All About Cloth Diapers. These are both great resources if you would like to use a method other than the one I chose. I went with the method I could use without buying any new detergents or cleansing agents because I wanted to start treating my diapers the moment I learned what the heck was going on.
Backstory:
My twins had suffered red bottoms 3 times before I figured out what the problem was. I took my dear daughter (DD) and dear son (DS) to the pediatrician because I thought for sure this was a yeast rash, since it was so persistent. I treated the diapers for yeast (see post HERE) once with tea tree oil, stripping and oxiclean and then a second time with bleach (which you aren’t supposed to use because it decreases the life of the diapers). The pediatrician swabbed DD’s rash to check for yeast and gave us a prescription for a prescription anti-fungal. After we put both kids in hybrid diapers with disposable inserts and used the prescription cream, the rash started clearing up. After having treated the diapers, I thought I was in the clear to start using them again once the rash was completely gone. Um, not the case. Why? It wasn’t yeast! The culture swab came back negative for yeast.
I put DD in cloth again and 3 diapers later she had a serious burn AGAIN. I was very upset. What was I doing wrong? What else could this be, if not yeast? I started reaching out to fellow cloth diaper users on Facebook. After several suggestions that the twins suddenly BOTH became sensitive to our detergent (which I found very unlikely), someone suggested that I boil the diapers. This sounded like a good idea to me. I started boiling diaper inserts (not my AIOs) and continued to research online. The next morning I checked Facebook and found a reply saying that it sounded like ammonia burn. This immediately felt right to me because when I saw how bad the rash was, I thought “this looks like a burn!”. DD had blistered! (See the post HERE for how we quickly healed the ammonia burn/rash.) I then had some specific information to look up. I found the above mentioned websites and began to treat. Since I was already boiling diapers, I continued using that method.
Boiling Diapers:
Use the largest pot you have and fill it 3/4 the way full. Use long tongs to add and remove diapers. After water has come to a boil, slowly add one diaper or diaper insert at a time. (I’m just going to say that this is a crucial point. I got lazy after a few pots of diapers and added too many at one time. The pot boiled over, I had a flooded stove, and the water spilled into the cabinet below onto all my pots and pans and the floor. Then I had to keep two toddlers out of the kitchen, with a hot water covered floor and clean up everything. Spare yourself and add the diapers slowly.) You can boil between 15-30 minutes but if you are boiling anything with PUL I’d go with 15 minutes. Longer may damage/melt your diapers. Pooters also suggests that diapers older than 2 years shouldn’t be boiled because it may damage them beyond repair. I then removed the diapers one at a time and placed them in a metal rubber coated bowl. Make sure your container won’t melt with the heat of the diapers! I then took the diapers over to the sink and placed them in a colander to drip. After they cooled off a bit, I took them to the washing machine.
After boiling I rinsed the diapers in cold. I have a front load HE washer and I will give you the setting I used along the way. After rinsing, I washed the diapers with the Kirkland biodegradable liquid laundry detergent and put vinegar in the laundry softener compartment. I usually use Tiny Bubbles Detergent because it is specific for cloth diapers. If you use a non-cloth diaper specific detergent you can get buildup from the detergent in your diapers that can cause stink and other problems. I set the washer to Hot/Cold, heavy soil, extra rinse, and water plus. After this cycle was complete I added another rinse to total 1 pre-rinse and 3 post-wash rinses.
I REALLY didn’t want to boil my AIOs, for fear that the waterproofing layer would melt. Instead, I washed them separately on the sanitary cycle with Tiny Bubbles Detergent and then washed according to the above directions. After DD had one pee in the unboiled AIO, I could smell ammonia (not as strong as it was before but still). So, I got over my fear and boiled my AIOs, three diapers at a time, for 15 minutes each set followed by the post boil wash routine from above.
I knew this had worked once I put the kids in a diaper and smelled didn’t smell the ammonia aroma from a soiled diaper! No red bottoms! I wish that ammonia build up was talked about more as a frequent problem. I have heard of several moms who happily cloth diapered for over a year, and suddenly had to give it up because of severe diaper rash. I’m thinking ammonia could have been the culprit.
Because of this discovery, I have changed my wash routine. I now, pre-rinse cold (I used to just push the prewash button), wash Hot/Cold with Tiny Bubbles Detergent & 1/2 scoop oxiclean, use the heavy soil, water plus and extra rinse settings, as well as add one more extra rinse at the end. I also wash monthly with the Kirkland detergent mentioned above to prevent buildup. I used to wash every other day but am now washing every day. I read a BumGenius recommendation stating that 12-15 AIOs are considered a full load for an HE machine. Yikes! I was totally overloading my machine! I think I was washing 16 AIOs plus the same amount of inserts AND cloth wipes too! I’m now also soaking the overnight, nap time & poopie diapers in a wet pail with water and a few drops of tee tree oil.
After all this I started asking around to see if any fellow cloth diapering mommas had experience telling the difference between a yeast rash and an ammonia burn. One mom suggested that if you put a cup of baking soda in baby’s warm bath the rash should improve if it is not yeast. If it remains the same by the next morning, then it may be yeast or a bacterial infection. I’d say, if you take baby to the doctor and the doctor swabs the rash, the results will give you the best information. In our case, the swab came back negative for anything. This makes perfect sense since it was an ammonia burn and not a bug of any kind.
It amazes me how much there is to know about parenting, cloth diapering, and life in general. I hope I have made this cloth diaper journey a bit easier on at least one of you! What’s your wash routine? Is it working for you? Share in a comment on this post and help save someone else from reinventing the wheel!
I just came across two great sites to add to this post and I wanted to add them! The first is a thread about washing, detergent and buildup and is REALLY informative. Click HERE to check it out. The second site is for a recipe to make your own cloth diaper detergent. Check out The Eco Friendly Family for this recipe! For my latest wash routine update click HERE.

Thanks for this post! I didn’t know I had a problem… but I think we do. I reacently made new fitted diapers for DS and expected baby. They don’t smell at all. That’s what got me researching today.
I use prefolds and wool almost exclusively. My prefolds smell funky when peed in. It’s only very slightly ammonia-ish, more like beef jerky. I don’t know…. Anyway, I’m off to boil my prefolds. Hopefully that will help the smell.
I used to have terrible problems with the ammonia smell too. (I have hard water which exacerbates the problem) The detergent that seems to work very well is watkins. I get it through amazon. And once a month I use RLR.
Great post. Some people are afraid to boil their diapers, good for you for taking the plunge.
Remember, water boils at only 212 degrees. It’s not likely to melt anything.
We must be living at the same house. I’m having this EXACT same problem and practically have gone through the same motions. I also wish that I had known more about this issue. I have been happily CDing for 16 months and when this issue hit, I felt totally befuddled. I feel horrible for my daughter’s awful looking bum. Thanks so much for writing this post. I’m off to boil my diapers.
@Laura,
I’m so glad it helped! I’ve been CDing for over 2 years now and I was very frustrated to think that I might HAVE to use disposable inserts for the short remaining time before the twins are potty trained (that’s some positive thinking on my part!). Best of luck. Please come back and post how it worked for you!
I tried boiling, but it wasn’t enough to make them super clean. I bought some Funk Rock and Hard Rock detergent from Rockin’ Green. I used both and turned up the dial on my water heater (I made sure I turned it back down after my diaper mission) Oh yeah! Now those are some clean diapers! Totally worked and I would highly recommended these products.
I’m thinking I may have a slight ammonia build up. With pocket diapers do you only boil the inserts? The shell should be fine? I am gonna give this a whirl! Thanks!
Chantelle, yes, just the inserts – as long as the shells don’t have cloth for the ammonia to accumulate in.
let me know how it works for you!
Thank you thank you thank you thank you!!!!! OMG I have been having this problem for about 2.5 weeks now and my daughter has been in pampers, because every single time i put her in the cloth she get blisters and starts convalsing from the pain, the pot is on to boil, you might have just saved us from going to pampers!!! Thank you thank you thank you!!!!
Carissa, you’re welcome! I hope it works for you!
Sounds like my problem now! Little girl got a horrible rash after a bout of sick poos and it just would.not.go.away….and I figured out that it was because of the ammonia buildup on her diapers. The smell is god-awful. Now that her rash is healing up after putting her in disposables (that I had left over from a two day diaper strip-a-thon) for the last couple days, I think I’ll make this my weekend project and see if it helps!
btw, ammonia smell is bad, and about ten times worse when you’re pregnant. My husband almost made me stop touching them. I still have some dirty diapers…would you recommend giving those a quick wash before boiling? (Some have poo on them still.)
@Kimberly,
I would wash them before boiling them. Otherwise you will need to wash your pot and start a whole new pot of water for the next boil. It takes several loads to get all the diapers boiled since you can only boil a few AIOs or 10ish inserts at a time. I added a bowl full of water after each load, brought to a boil again, and then added the next batch of diapers.
I think some of my inserts are starting to have ammonia build up cause it still smells a little like pee when they come out of the wash- mainly the overnight inserts. Better get to boiling!
Wonder what it is about the boiling that helps!
Thanks!! I boiled my help inserts. Will do the same for the microfiber and my AIO’s. I will try RLR, too.
Omg SO glad I saw this post! My daughters diapers smell horrible after she pees just once. I have been thinking about going back to disposables even though id much rather do cloth, so happy I came across this cause it sounds like my exact problem. Going to try to boil them and wash like stated above and hope it works =)
Also wondering is there anyone here that makes their own det (I use the duggar recipe) and washes their cloth diapers in that?
Also I use disposables at night cause my daughter leaks through the cloth, I use bumgenius AIOs and I have tried to add additional inserts to the point that her diaper barely closes and I still get leaks! It there another type of diaper or brand of cloth that is meant for nighttime and heavy wetters?
thanks for any help =)
@Kristin,
I use GroVia AIO’s overnight with either an extra bamboo or gCloth insert. This gets us through most every night! My kids sleep 12 hours. There are nights when they have had too much water before bed and NO diaper could hold all the pee, but these are great 99% of the time. I have also used biodiapers from GroVia with a small gDiaper disposable insert for a doubler. This makes it through the nights when we are out of cloth for stripping, boiling, or rash healing.
I use a homemade recipe from theecofriendlyfamily.com It’s similar to other detergents, it just uses oxiclean free instead of soap. I’ve been using it for about 6months.
For nighttime heavy wetters… I use a prefold (I use mostly prefolds because they are simple and easy to clean!)snappied with one bamboo insert folded in wetzone with a fleece liner (keep the bum dry) with an aristocrats wool cover! (just recently he started nursing NON STOP through the night, so I added another bamboo insert on the OUTSIDE of the prefold before I put on the wool.) Works great! On vacation he soaked through 2disposables a night… HEAVY wetter!
I boiled the pee (haha) out of my diapers before too. Some people thought I was crazy, but I could literally see the pee in the water.
[...] The blog with boiling instructions: http://mommawords.com/2011/07/31/treating-ammonia-build-up-in-cloth-diapers/ [...]
Thanks for the post! I think ammonia from detergent residue build up is a lot more common than most moms realize. I find that different detergents work in different water better for some than others It’s always a good idea to try something different when you end up with a problem, sometimes just switching things up is all it takes.
Thanks for this. This past week has been almost unbearable for the smell. I’ve done brief strips w/ Dawn or Calgon or RLR in the past but it’s been a while. We’ve been CDing since DD was born 7 months ago plus some of the inserts were used in her older sisters cloth pull ups & had never been stripped. I’m still a little nervous about boiling PUL (have heard conflicting info on this one) so I am currently stripping those in RLR while I boil my mf inserts & cotton prefolds (these were the stinkiest!!) So far, one batch is boiled & I was left w/ yellowish water. *blech! Been seeing a lot of people talking about boiling diapers lately too. Here’s hoping this works!
Karen,
I hope it works for you! I still have yet to have any issues with my boiled diapers with PUL. No de-lamination, just excessive wear because I don’t line dry my AIO’s. It’s tough to be able to buy enough AIOs to not have to worry about the extra time it takes to line dry when you have 2 or more in diapers!
[...] see my post on Ammonia Build up for another reason your little one might be getting a horrid diaper rash and for my latest [...]