I discovered a Medium article that tested out a handful of cat repellers. The author did not just glance through product reviews; they personally ran practical experiments to determine which ones worked and which were useless. It was basically outsourcing the hassle on our behalf. Read more now on www.medium.com/@john-gardener/5-best-cats-repellers-i-tried-them-all-d62c1715c811.

Their opening experiment was a water-spraying motion detector. Imagine a burglar alarm, except it sprays liquid on your local kitty intruder. The article claimed it worked on the spot. Cats can’t stand surprise showers. The downside? Even your own boots could get soaked, and you might step into it yourself.
The second repeller was an ultrasonic gadget. It produces noises that are high-frequency and audible only to cats. The reviewer said the theory seemed clever, but the results? Mixed. Some cats bolted, while others remained unfazed like wise philosophers, no doubt criticizing humanity for pointlessly using energy.
Next in line was a scent-based repellent in the form of granules. Imagine it being a barrier made of smell. According to the article, it did the job for a short time in gardens, but rain washed it away. That meant continuous replacement, which costs more money. Good only for short-term use, not long-term.
The another test involved spike mats. Not dangerous, just awkward. When a cat touches it, they quickly decide, “No thanks, the grass is better.” The product is affordable, basic, and works well, but not pretty. Picture having guests over and needing to justify why your yard looks like a minefield. Still, it works.
The final product was a fence accessory, a rotating bar that rotates when cats attempt to climb. They slip, not hurt, but thwarted. Reading about it was hilarious, almost like a blooper reel, where the cat makes attempt after attempt before storming off indignantly.