I had major problems using Revolution (bunnydied). I use kitty flea powder when needed, and a flea comb a coupledays after powdering. I'm experimenting with this really smelly oilcalled Tea Tree Oil (melaleuca)--drop it on the comb and brush thru thefur. So far so good, but the jury's still out on that one.
I wouldn't advise washing. They detest water and the dog shampoo might be kind of harsh.
Oh yeah, if the bunny is only a month you can't use the powder (must be12 wks). Try the comb though, but you have to do it thoroughly andoften. Also you could try powdering with garlic powder, which I haveyet to try (but it's safe, ask the others who feed bunnies garlic).
If you try melaleuca, it's kind of strong so try not to get it right onthe skin. It gets a little red. Just comb through the fur.
I'm always worried about fleas on young bunnies because you can'treally use anything chemical at that age. Good luck, and let us allknow if you find something that works (and beware of vets who tell yousomething's safe for bunnies and often don't really have a clue....)
Rose