In my experience, no matter how careful anyone is, I now have sharp, freshly-cut hair bits under my shirt. Unless I take my shirt off and wipe my body with a towel, no amount of post-cut washing of my head is going to solve the problem.
Listen buddy I'm going to level with you. All of us that go home and shower had probably one bad experience as a kid and have vowed to never EVER let that happen again. Waterboarding has nothing on itchy, cut hair.