A cat that eats soap would have very clean insides and leave no stains if and when it did as Crikey suggested.
Were you thinking soap bubbles?
A cat of my earlier acquaintance ate smoked salmon for preference, it would have been appreciated if she had then taken a liking to toothpaste.
But
Probably best to wean a cat off the soap and toothpaste.
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Buttercup: You mock my pain! Man in Black: Life is pain, Highness. Anyone who says differently is selling something.
