Sometimes in the wiping process, it never ends. You get the outer layer clean, but you are suspicious. It's definitely not over. You dig in a little, maybe find a clean corner here, messy corner there, but it's hard to know when it ends. In my wiping method (small pieces, never big wads), you go for more discrete attempts than you normally would: a bunch of small, targeted stabs at the end that constantly uncover new, yet-uncleaned pockets. You eventually give up figuring you've reached a stable equilibrium, but particularly on a hot or cold (and hence layered) day, that sweat or extra fabric feels really unsettling the rest of the day. And the next one is clean or whatever. And you take a shower eventually.