Unexplained bad vajayjay odor 🙀

Ladies. For the last 3 cycles, Ive noticed like an acidic/sour odor down there. Dont have BV , yeast, or any unusual discharge. I wash at least daily, and at least 2x daily on my period. No change in detergents or lubricant. I use cotton undies only. Same sexual partner for over 10 years and his hygeine is very good. He works from home and Im a SAHM so I dont suspect cheating cuz he wouldnt even have a chance to 🤣 Ive tried labial exfoliation. Im not currently pregnant. What can I try to neutralize it??? Ive heard the special washes just tend to throw off your ph. Help!! 😿😿🥴

Casey: off period as well. I only tried exfoliation recently to mitigate the persisting odor, I usually dont exfoliate or scrub etc.