Any good remedies for a diaper rash??

Anais

Does anyone know of a good remedie for diaper rash? My son has had a bad rash in between his thighs and I've used coconut oil, vasaline, desitin and burt beez but nothing has worked. Tomorrow I'm going to let him sit in the tub with baking soda i heard it helps but is there anything else i can do? Thank you