The Rabbi Rocks:
“your supposed to wash and eat s/t hot”
Where do you get that from?
Look in Rashi in the sugya in shabbos, where he says that Chamin B’motzei shabbos is done either by eating/drinking something hot, or by having a hot bath/shower!
I will try to get back to you with an exact grid ref for this rashi (I saw this years ago, and made a mental note of it)