Which of the following is a part of nail technician services?

Cleansing and polishing nails is a fundamental part of nail technician services. This activity directly pertains to the care and aesthetic enhancement of the nails, which is the primary focus of a nail technician's expertise. Nail technicians are trained to perform various services related to the health and appearance of nails, including cleaning, shaping, and applying polish, as well as nail art.

In contrast, other services listed, such as performing facials, hair removal from the face, or providing tanning services, fall under different specializations within the beauty and wellness industry. Facials typically involve skincare practices which are the domain of estheticians, hair removal is often performed by cosmetologists or estheticians as well, and tanning services may be offered by specialists in body treatments. Therefore, these options do not align with the specific services typically provided by nail technicians.