NOt sure why you feel the need to flush your rabbit's ears... I have not seen a rabbit with sufficient wax in its ears that I felt it needed to be cleaned out and I have seen a LOT of rabbits. Ear mites are a different issue, but still I leave those rabbit's ears alone for the most part (just kill the mites systemically and the ears usually clear up on their own). I have never flushed a rabbit's ears, but I have flushed hundreds of dog and some cat ears... be gentle and try to suck out most of the remaining liquid after you are done flushing... but I rec: getting a vet's opinion as to whether it really needs to be done... rabbits certainly do have very sensitive ears!