When you color your hair you have 2o to 30 minutes to kill.
It MIGHT seem like a good idea to use that time to clean the bathroom.
Hmmm... it could be a problem though when you clean behind the
toilet and your head bumps the wall and gets color on it. Not to
worry, but it could be that when you wipe the wall you get color
on the seat of the toilet.
Did you know that color stains a toilet seat?
But if you scrub really hard it comes off...
only so does the paint on said seat.
It is probably better to use your sister's advice and sit in a
warm bath while the color cooks on your head.
That is, unless you had a prenatal cleaning frenzy
and have scrubbed an old tub so hard that it is a bit
etched and absorbs hair color. Then it would become stained.
Not that this has ever happened to me or anything.