When we first got Diego, his ears were filthy and the vet cleaned them and demonstrated, he use his surgery clamp just to hold some cotton wool and he put it in Diego's ear and released it saying where it stopped naturally is as far as you go, do not try go past this. Now I haven't tried that, when we got Ryu I just used a damp cloth, and did a little cleaning, he wouldn't sit still. Diego though I shouldn't say it but he's a retarded cat (in a nice way) he doesn't care what you do to him. Trim his nails, give him a shower clean his ears, he just doesn't give a hoot. If he lies near the door which he does often and you try tap him with your foot, he stays asleep, so we got into the habit of opening the door and pushing him along with it, and he doesn't move, little weirdo.
Sorry that was a bit of a hijack. That was just my way of saying I have a docile cat that doesn't care about any grooming/care/cleaning.