Cathy, my vet said that isnt true. I asked when I had to clean Puffs ear, and she said that that is a common misconception

She always used peroxide to clean wounds, abcesses, etc.

Also, the years I worked as a tech assistant, we ALWAYS used peroxide, because betadine stings, and that will make it unpleasant for the kitty.

It worked for Puff.

I think it is only true of deep open wounds, in which you would have to flush