If you won a gift certificate for a full car detailing do you tip the person coming out to clean your car And if so how much?

Yes, it's customary to tip the person who comes to clean your car, even if you received a gift certificate. A tip of 10-20% of the service cost is generally appropriate, depending on the quality of the service provided. If the detailing is exceptional or the person goes above and beyond, consider tipping more. Tipping is a nice way to show appreciation for their hard work.