What type of solution is used to remove water-insoluble wax?

An oil-based solution is the correct choice for removing water-insoluble wax. The reason for this lies in the chemical properties of the wax itself. Water-insoluble waxes do not mix with water, meaning a water-based solution would not effectively dissolve or remove them. Instead, an oil-based solution, which is non-polar, can effectively interact with the wax, breaking it down and allowing for easy removal from the skin.

In contrast, an alcohol-based solution may not be as effective as an oil-based solution for this specific purpose, as while alcohol can dissolve some substances, it generally does not work well with water-insoluble waxes. Similarly, saline solutions are primarily made up of water and salt, and would similarly fail to adequately penetrate and dissolve wax. Understanding these principles is key for estheticians when selecting the appropriate products for hair removal and skin care, ensuring effective and safe client treatments.