Which of the following is an essential product used for nail preparation before applying enhancements?

Nail cleanser is indeed an essential product used for nail preparation before applying enhancements. This product serves the important purpose of cleaning the nail plate, removing oils, dirt, and any remaining residues that can interfere with the adherence of the nail enhancements. Proper nail preparation is critical to ensure that the enhancements bond effectively to the natural nails, enhancing their longevity and reducing the risk of lifting.

Using a nail cleanser establishes a clean canvas, allowing for better adhesion of subsequent products, like base coats or directly applied enhancements. It is key in ensuring optimal results and maintaining the health of the natural nails underneath.

Other products listed, such as base coat and top coat, play significant roles during and after the application process, but they do not serve the primary function of preparing the natural nail surface. Nail polish remover is typically used to remove existing nail polish rather than to prepare nails for enhancements. Thus, nail cleanser stands out as the crucial product for this initial preparation step.