training for a marathon and the chafing and odor from long runs is becoming a real problem

i'm logging 50+ miles a week right now and between the sweat, the synthetic fabrics, and hours of running, things are constantly irritated and off balance down there. i shower immediately after every run but by the time i get home after a long one i'm already uncomfortable. i've tried different shorts, different underwear, body glide, nothing is fully solving it.

someone in my running group mentioned switching to a ph balanced wash specifically for intimate areas made a difference for her with the same issue. she uses the uro intimate wash and said the irritation and odor after long runs improved a lot. i hadn't thought about the wash being part of the problem before. anyone else dealt with this as an endurance athlete?