Cleansers Contain:

Surfactants: Remove dirt, oil & debris from the skin
Hydrating Agents: emollients & humectants retain skin's moisture & keep the skin barrier intact
Misc: pH stabilizers, thickeners, preservative
Actives/ Exfoliants: gives extra benefits to the cleansers, it's not necessary but good to have
Aqua/ Oils/ Extracts: the base of the product

? Brushing up on the label lingo can have you finding the right ingredients for you in no time.