Removing internal organs
The front eye of the octopus is attached to the head and legs.
The other side is separated from the head. You can turn your head upside down with this part.

Please turn it upside down and remove the intestines.

Removing Eyes
It's easiest to cut the eyes with scissors. So I just remove it with scissors.

Removing the Mouth
If you turn your legs upside down, you'll see your mouth like this way.
If you press it with both of your big nails, your mouth will pop out.

It removes the mouth like this.

Removing impurities and mucus
If you touch the octopus, you'll see that it has a lot of mucus. It's slippery. You also have to remove the impurities on the octopus.
Pour a cup of flour into the trimmed octopus.

Rub the octopus against it like washing it. Flour adsorbs impurities and also mucus components. At this time, please sweep your legs one by one. To remove impurities from the octopus's sucker.

Rinse thoroughly
Rinse the octopus thoroughly under running water several times after kneading it with flour.

Finished preparing the octopus. It became a clean octopus.