Alice needs some cleaning, so her human carpet applies to help. You can see an extensive and detailed show of her soles before the cleaning action, with all the dirt that's sticked there. Something has been surely crushed under her feet: would you be able to understand what has been smeared under there? What has been walked on by her for so long to get smushed that way?

In this clip you can see the action from a camera pointing at Alice's feet, to see in detail the tongue work on the soles. you will see Alice fullbody only at the start and end of the clip.