Shed Buster - Used

I used this for my Shiba Inu. It was perfect for removing undercoat fur. My dog didn't seem to mind it, which was great.
I am also selling another comb for grooming.
I have home-cleaned this item using sesquicarbonate, citric acid, and baking soda. The coarser comb was unused, but it had rusted and the rust could not be removed by cleaning. The handle also had dirt that could not be removed.
This is a used item, so I am looking for buyers who understand this. Thank you.