I used spot remover on my dog. Now I can't find him.
Reminds me of he story about the youth, who covered himself in invisible ink, and then went out to rob a bank.
I think it was lemon juice. Lemon juice is like invisible ink until paper is heated. But.. found info ...
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An example derived from cognitive bias evident in the criminal case of McArthur Wheeler, who, on April 19, 1995, robbed two banks while his face was covered with lemon juice, which he believed would make him invisible to the surveillance cameras. This belief was apparently based on his misunderstanding of the chemical properties of lemon juice as an invisible ink.