I hate the idea of using water because I'm afraid of it getting in their ears, so I use canned air for cleaning computer keyboards -- it sounds like hissing -- and a firm "NO" when they do certain things (getting on the kitchen counters, trying to get outside, etc.). Pointing at them and using a firm "NO" helps when they are close, as does blowing in their face. I also put Casper in a "time out" (remove him or myself for a few minutes/ignore him) when he plays too rough and/or uses claws/teeth. So far Casper is the only one of our kittens we have had to clip claws on, which definitely helps with minimize damage.Btw, how does everyone feel about spraying her with water when she starts biting or clawing?