the appropriate amount to pay a teenager for washing your car would depend on various factors such as:
Location: Wages can vary significantly based on the cost of living in different regions.
Local standards: What is considered a fair wage for a teenager's work in your area?
Scope of work: Is it just a basic car wash or do you expect additional services like interior cleaning, waxing, etc.?
Time and effort required: How dirty is the car, and how much time and effort will it take to get it properly cleaned?
Local minimum wage laws: Ensure you comply with local labor laws and minimum wage regulations.
A reasonable approach would be to research the local wages for similar services or ask other people in your area what they typically pay for a car wash. Remember, it's important to offer a fair wage that acknowledges the teenager's efforts and encourages them to do a good job.