Harpic is the best toilet cleaner. I have tried many other brands too including locally available acid products. Overall resulting the product cleans most is damages to the sinks most with its high acidic value. And the product smells best is cleans less. With the balance of cleaning and refreshing, Harpic is working best, especially in Indian toilets if we use it at regular basis.
As per the product’s TV commercial they also challenging other brands to prove, which is worth saying.