An anti-fraud system for a car wash station that includes a moisture sensor for sensing moisture within the car wash station, and a sensor controller adapted to operatively connect a power source with a timer of the car wash station. The sensor controller performing the following program: disconnecting the power source from the timer upon sensing moisture via the moisture sensor; waiting a period of time; sensing whether the moisture sensor detects moisture; and waiting another period of time and repeating if moisture is sensed, or reconnecting the power source to the timer if no moisture is sensed.