Which of the following is not used in tip application?

In the process of applying nail tips, cleaning the nail is not a direct part of the application itself. The purpose of cleaning the nail is typically to prepare the nail for enhancement, ensuring that any oils, dust, or debris are removed. This step is important for overall nail care, but it does not specifically pertain to the act of applying the tips, which involves adhering the tips to the natural nail using adhesive, trimming the tips to fit, and shaping them after application for a smooth and polished look.

In contrast, applying adhesive is crucial, as it secures the tip to the nail; trimming the tips is necessary to ensure they fit well and align properly with the natural nail; and shaping the natural nail is important to create a proper foundation for the tips. Therefore, while cleaning the nail plays a critical role in the nail preparation process, it is not a method employed during the actual tip application phase.