Hand sanitizer like Purell on the rear, before and after riding. It's basically alcohol in a gel form. Don't get it near the middle, of course.
Then a tiny bit of bag balm over the Purell. Hardly any at all.
Wash your shorts in warm water, add a tablespoon of chlorine bleach to the water and let it agitate before adding clothes. It won't bleach them or affect the lycra but does control odor and whatever might be stubborn in the chamois.
Also, a certain magnesium supplement really gave me sores until I stopped. Not sure why.
Finally, I was still having an occasional sore until I rode a rented bike with saddle further back than normal for a week (my saddle on rented bike). No sores after I modified the saddle location on my own bike. Yes, I did have a professional fit, but I guess it wasn't optimal.