I was searching for others who had experienced this! I first experienced it with a cat that I had for many years, but it was mild. I just noticed she would sniff my hands or surface in the house if I used bleach cleaner. More recently, my roommate and I brought in a litter of strays and wound up keeping two brothers. These guys go crazy over the smell of bleach! I use it sometimes to clean the floor around the litter box, and one day I did it and the two of them ran over and hit the floor as soon as they smelled it. They started writhing around all over the floor like they were doing modern dance together or something. It's hilarious. I do know that bleach isn't harmful (I've read that in emergencies, like after an earthquake or something that interrupts clean water supply, you can put tiny amounts of bleach in water to purify it for drinking) so I haven't stopped it. I just make sure to wipe it up thoroughly so I am sure they're not getting it on their skin. It doesn't surprise me to find other cats are like this, since my first cat was not related to the brothers. It is really wild that the response from those two is much stronger than their response to cat nip.