Larry Dunn has stolen Kenny's fancy rabbit-fur-lined gloves. It's not surprising that he did this, because he usually wears socks as mittens, so the temptation to steal some good quality gloves proved too hard to resist. Although Kenny suspects Larry, he doesn't know for sure. In any case, Larry's gloves are black, whereas Kenny's were brown.
But on the way home one day, the truth is finally revealed. Larry administers something he calls a "Maytag Wash," which involves shoving ice and snow into Kenny's and Rufus's jackets. Kenny and Rufus then realize that the ice and snow is covered with black boot polish. Now Kenny has hard evidence that Larry stole his gloves and dyed them with black boot polish to cover up his theft.