Response to 10 Lifehacks Every Cat Owner Should Know:
A spray bottle with water works great if you are consistent. Nanci is right, after a while you can just leave it in sight and that’s enough. For night time, I had a cat I couldn’t break from going on my kitchen counters and I finally crumpled up wax paper and foil, partially smoothed them out and covered my counters. When my cat jumped up in the dark, it made noise and frightened him off. It worked pretty quickly and he was a very smart, stubborn cat (and the most beautiful 25 pound black persian mix I have ever seen). Good luck.