Any one have problems with smelly Itti bitti's. Like big ammonia smell.
I had 2 AIO i sold on TM and The lady has washed them and she says they smell really bad.

And I gave advice of vinegar and sunlight and she says she's done all of this and stripping them and now she's saying as soon as her child wee's in them again the smell really bad and making him itchy and sore.
I'm not sure what to do about it. She's really disapointed.
I sold them cause DS soaks through IB within an hour.
Any ideas, of how to rid the smell.