S.S.
You could try to make a game of it, say, see how few wet wipes you can use before the last one come out clean? I'm sure we will be going through the same thing with our son, who at 4 we still wipe. He's in preschool and luckily he's never pooped there, but he knows that when he does it's his responsibility. It's a double-edged sword for me, because while I want him to be independent and learn this skill, I know he has a hard time reaching and I actually like that I don't have to deal with skid marks or rashes.