Which of the following is NOT included in the SK+ unlimited plan?

The rationale behind selecting that option as the correct answer lies in the specific offerings of the SK+ unlimited plan. The SK+ unlimited plan is designed to provide a range of services related to car washes, including features that enhance the washing experience, such as unlimited washes, Rain-X treatment, and tire dressing.

However, a free monthly car rental indicates a completely different service that falls outside the typical scope of car wash packages. This particular benefit is not related to the primary service of washing or detailing a vehicle, thus making it an anomaly in the context of what the SK+ unlimited plan covers.

Understanding the key components of the plan helps in distinguishing between included services and unrelated offerings, which is essential for anyone considering this plan.