What is one common question to ask a client before their spray tan session?

Asking about the client's last shower, shave, and exfoliation is crucial because these steps significantly impact the effectiveness of the spray tan. Proper preparation helps ensure that the skin is clean, free from oils, and has an even texture, allowing the tanning solution to adhere properly for a more uniform and longer-lasting tan. If a client hasn't taken these steps, it can lead to uneven coloring or issues with the tan developing as intended.

The other options, while relevant in certain contexts, do not directly address the immediate needs for the spray tan application. Knowing the preferred tanning lotion or frequency of tanning at other salons may provide insights into client preferences but does not directly affect the outcome of the spray tan. Similarly, asking about a preference for a natural or darker tan can guide the technician in choosing the right shade but isn't as critical to the application process as ensuring that the skin is properly prepped.