What is best soap to use for daily showers with intertrigo?

Antebacterial. There is no specific brand to use, but i recommend anti-bacterial brand because intertrigo allows for infection to set in in the inflamed areas. Make sure to keep the affected area clean and dry.
Best Soap. Does this almost universally thought to be the best and mildest cleanser going. This is not really a "soap" as much as it is a cleanser which has softening properties. We really like dove bar best and i would not use any liquid soaps because they are all more drying than just about any bar soap going. Same goes for intertrigo but there are other ways to help that, including powders like caldesene.