1. A sunscreen detector, comprising: an illumination system configured to emit UV light, included in a UV illumination field, and IR light, included in an IR illumination field; a sensor system, the sensor system configured to: detect at least a portion of the UV light and the IR light at a sensor field located within the UV illumination field and the IR illumination field, generate a UV signal associated with the detected UV light, and generate an IR signal associated with the detected IR light; and a controller configured to: receive the UV signal and the IR signal from the sensor system, compare the UV signal to a UV threshold, compare the IR signal to an IR threshold, and output a first output signal when the IR signal is above the IR threshold and the UV signal is below the UV threshold.