I'm working on a face wash recipe and I have read that it is necessary to use multiple surfactants in order to increase mildness of a formula. I'm thinking of trying out Disodium Laureth Sulfosuccinate and I wasn't sure if it it mild enough on its own or if mixing it with another surfactant would be better ( milder). One site I was checking out recommended using Cocoamidopropyl Betaine in every face wash to increase the mildness of the other surfactants. Is this necessary/helpful. Any recommendations.