R.H.
We are currently working on the same thing at our house. First my son wipes with toilet paper and then those KanDoo wipes (big kid wipes from Pampers...purple/green package with frog on it). These seem to help a lot. I tell him to be sure to wipe until he doesn't see the yucky anymore. The cartoon frog on the package is pictured wiping his booty, so that helps with the technique also. Oh what an adventure it is!!! Good luck.
RCH