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While the noise machines might have some value, there have been few studies on their usefulness.
One study: In a study testing the effectiveness of an ultrasonic device on rats and mice (Greaves and Rowe 1969), it was found that they had a mild aversion to the sound. However, this dislike diminished over time, especially after a reliable food source was discovered near the sonic device. Even after the food source was removed, the rats and mice continued to explore the room with ultrasonic sound, expressing habituation to the sound.
I heard the urine story before. Unfortunately, it would drive my wife away and I would have to sell my RV.
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