It might be popular but it's doing nothing for your skin.
Cetaphil Gentle Skin Cleanser contains just eight ingredients: water, cetyl alcohol, propylene glycol, sodium lauryl sulfate, stearyl alcohol, methylparaben, propylparaben, butylparaben.
All but the water are chemically manufactured (let’s hope), and propylene glycol, sodium lauryl sulfate, and the three parabens have a seat on the dirty dozen, a list of cosmetic ingredients to avoid as potentially toxic.
A quick search and you'll find a host of bad reviews about Cetaphil and its products.
...or just paranoid?