S.2.
I don't really have any new advice from the comments you've already received....wet wipes, front to back, wipe til nothing appears on wipe.
However...I DO have a funny story to share. My 2nd didn't want to learn to wipe, I think she'd be happy if I did it forever. I drew the line (for the 2nd time) when she turned 6. No matter what, I'm done wiping. but one day she called me in there because the wet wipes container was empty. I filled it and she was in the middle of chitchatting to me so I leaned on the dryer and talked with her. Well.....when she was done wiping she stood up, grabbed her undies and instead of pulling them up to her waist she pulled them up to her chest! Then after a second pulled them back down to her knees. This all happened pretty fast and I'm sure I had a confused look on my face but before I could ask "what the heck are you doing?!" she said "this is how I check to see if I need to wipe more". It was all I could do to not burst out laughing!! The poor child checks for skid marks to know if she's wiped enough! Man, kids can be so funny!!