If you think about it, when clothes spin in a drum, they don't spin against the drum - they spin with it.
So there is no friction between the garment and the drum - so the outside is not gonna be particularly affected on its own.
What happens is that the garment gets repeatedly twisted as it falls from the top of the drum to the bottom as the drum slows down.
Therefore, as Flo says, marks inside AND out.
WASH BY HAND
So there is no friction between the garment and the drum - so the outside is not gonna be particularly affected on its own.
What happens is that the garment gets repeatedly twisted as it falls from the top of the drum to the bottom as the drum slows down.
Therefore, as Flo says, marks inside AND out.
WASH BY HAND