People who regularly clean their car enjoy their car more. They have a tactile relationship with one of their most valuable possessions. Even if their car isn't new or expensive, it's still a really cool object.
It's easier to appreciate something when you really pay attention to it. Caring for something requires this attention.
Whether it's organizing your phone, cleaning out your fridge, or running a brush through your cat's fur, these types of behavior put you in touch with everyday treasures that you take for granted.