The black ring of defiance

Nathan loves taking baths. What he doesn't love is having his neck washed. Every single night he willingly lets me pour water over his head and his eyes to wash his hear but try to go near his neck? This kid has the reflexes of a jungle cat.

He bends his head down as low as it will go and yells "No tickle, no tickle" over and over. Apparently his neck is extremely ticklish! I try telling him "I have to clean your neck, it's my job." And then the screaming changes to "No it's your job, no it's your job."

I don't know what to do. On days that he's been out playing in the dirt, he can get really dirty and I've seen the infamous black line kids get in their little neck creases. If he doesn't let up on me soon, I'm going to have to invest in some turtlenecks. Good thing the fall weather is coming!