Well, you'd be surprised at what substances can be repurposed like that. It turned out that the real answer was butter after all, but I can easily see someone, having heard of something like that being effective, getting confused and naming the wrong condiment.
Hmm, Yen Press calls the chapter "No Sweat".
It's the daddy dance!
"So Daddy's about to pass out. :D "
Yotsubako!
Aww, covering up Daddy...
And so, Koiwai runs his errands looking like a raccoon...