More re showering on Yom Tov

Posted too late for Shavuot (because I was sitting shiva for my father at the time and just saw it today), here's Rabbi Yehuda Hausman's pre-Shavuot presentation of the rules for taking a shower on a festival.

See toward the end of this post (below my so-called artwork) for other opinions (some say that shampooing is forbidden), and for links to yet other opinions.