Why does Kiki flood the floor of her flat to clean it? In this GIF from the cleaning montage in Kiki's Delivery Service, she's seen cleaning her flat by flooding the floor and scrubbing it down:

Is this a real way to clean wood flooring? Isn't that damaging to the wood? Wouldn't the water seep through the cracks? Isn't she above the bakery?
These are silly questions to ask but I am curious if this is a real technique or artistic choice of exaggerated animation.
She is scrubbing the floor.  It is a very common way to clean floors -- a search engine turned up many images showing people doing just this for &quot;scrub the floor.&quot; Given that the water is on it only in the short term, the damage is not extensive even over many years.
It can leak, like any other water spill, if the floor is not watertight.