How Does Soap Clean? The Simple Science
Soap molecules have one end that loves water and one that loves oil. Here is how that lets soap lift dirt, grease and germs off your skin.
Soap Guides
How to choose, read and understand soap: labels, soap types, scent, and what marketing words really mean.
7 articles
These guides explain how soap actually works and how to compare the products on the shelf. A good first read is how soap cleans, followed by soap pH explained. If you are choosing between formats, see bar soap vs body wash and castile soap vs regular soap.
Start here
Soap pH Explained: Why Real Soap Is Alkaline
True soap is naturally alkaline, while skin is slightly acidic. Here is what that means, what research says about soap pH, and when a pH-balanced cleanser makes sense.
Comparison
Castile Soap vs Regular Soap: What Is the Difference?
Castile soap is plant-oil soap, traditionally olive oil. Here is how it compares with typical store-bought bars and body washes in ingredients, feel and uses.
Comparison
Bar Soap vs Body Wash: Which Is Better?
Bar soap and body wash both get you clean. Here is how they really differ in ingredients, skin feel, cost, hygiene and packaging, so you can pick what suits you.
More in this topic
Comparison
Shampoo Bar vs Liquid Shampoo: Pros, Cons and Who Should Switch
Shampoo bars cut plastic and travel well, but soap-based and syndet bars behave very differently on hair. Here is how to choose.
Comparison
Antibacterial Soap vs Regular Soap: Is Antibacterial Better?
The FDA found no evidence that consumer antibacterial soaps prevent illness better than plain soap and water, and removed common antibacterial ingredients. Here is what changed.
Comparison
Sodium Lauryl Sulfate vs Soap: What Is the Difference?
SLS is a synthetic detergent found in many body washes and shampoos. Here is how it differs from true soap, what safety reviews say, and who might want to avoid it.