Firstly, aqua peeling uses AHAs and BHAs to first exfoliate our skin. This means they remove dead skin cells and impurities that are locked on to our face by our cells. All our skin cells are 'stuck' together by a type of 'glue' made by the cells which is what makes our skin look like a continuous layer on our body.
The skin is actually made of millions of cells that are stuck together in this way to protect the body. When a skin cell dies it can sometimes still stay stuck together with the rest of the cells along with other dirt that gets trapped.
Alpha Hydroxy Acids (AHAs) are a group of acids that are usually found in nearly all skin cosmetics. Most popular ones are glycolic acid and lactic acid which are especially found in any treatment related to acne and skin repair. Another popular effect is skin brightening which is done by ascorbic acid; commonly known as vitamin C.
This is because AHAs have incredible skin healing properties that affect the multiple layers of the skin. This is very useful when dealing with conditions like hyper-pigmentation which start in the deep layers of the skin and build up over time. Aqua peel in Korea takes advantage of these properties and combines it with BHAs.
Beta Hydroxy Acids (BHA) is similar to AHAs but they are different in their structure. The structure of AHAs means they can easily dissolve in water. This means they can take care of most of the dirt on the skin surface but BHA can dissolve in oil. This is important for areas that produce a lot of oil such as the nose, chin and forehead (The T-zone).
So AHA and BHA are used to clean the because it almost pulls the dirt out of our skin and this makes the first step of the aqua peel process.