Seeking Advice on 8 Year Old Son's Problem

R., I think I have an answer & solution to your 8 year old problem of not wiping after a bm.

The feces has a horrible smell when it accidently gets on your hand when wiping after a bm. I suggest you furnish those plastic gloves for him to use for thoroughly wiping after a bowel movement. Tell him he dispose the plastic glove & have a new one for each bm. Rightly, we should have bm's after each meal. So you need to have a supply of these disposable plastic gloves.
B. B.

I would go into the bathroom with him during a bowel movement and actually see "how" he does it. I would tell him to use the paper until there is no more poop on it. You can demonstrate this with brown marker if you like. This is how we demonstrate cleaning properly to children with special needs (not that your son has a special need, but it's a nice way to teach when kids are visual learners). He's also old enough to understand how being smelly will impact him socially.

I would not take things away from him, I would reward him instead when he smells "clean" and has visibly clean underwear.

One more thing, are his bowel movements very loose or hard? It may be extra hard for him to wipe away BMs that are really loose or hard. Could his diet be a problem?
The wet wipes are good to have and I would encourage you to keep using them.

My 6 year old has been struggling with this for a while. It has just gotten worse recently, and he seems to think it is funny when we bring it up with him. We got it a bit more under control when we found a clump in his underwear and I threw the underpants away! He was so devastated that I think it woke him up a bit. My husband threatens to throw them in the bath with him and make him wash them (he is joking) but these 2 things have seemed to work for him. I've also done the "wipe until the paper is clean" mantra. You could also try to get to the root of the problem. We uncovered that he feels in a time crunch at school and says if he wipes that long he won't have time to finish his snack. We've explained that it only takes an extra minute to wipe properly and that he will still have time for his snack, and I think that helped some too. At least it helped us to understand why he might not wipe as well as he could. One final comment is that when I was growing up there was a girl who always smelled and she used to get made fun of. I always felt sorry for her. The day he had the clump in his underwear I noticed he smelled (before I realized he had the clump) and the smell oddly reminded me of the way this girl smelled. When I realized what was causing the smell on my son, I told him this story of the poor girl who smelled and he found that story very interesting. He realized he wouldn't want to be "the boy that smelled". All of these things have helped improve this situation for us and he seems to take wiping properly a bit more seriously now.

Make the consequences be that he has to scrub out his underwear. This may motivate him!