Here is the beautiful relief: the ban usually only applies to Day One. By the time you wake up on the second day of the new year, the shower is fair game again. You can scrub to your heart’s content.
It’s like waiting for the grocery store to open after a holiday. The anticipation makes the hot water feel ten times more luxurious.
So, if you are reading this and your hair is already a disaster, just hold on. Your showerhead will welcome you back with open arms tomorrow morning.