Careful cleaning

Exploration Stage: Octopus Citadel
From: Violet
Description: I will certainly make the anonymous person who sent the threatening letter regret sending such a rude letter. You may have fooled me about the alligator, but you will never fool me! I will definitely find out what the substance was that was on the paper in large quantities. Is there any possibility that it might be bleach? That's what we'll look for.
Completed: It must have been in the cleaning toolbox! I don't think it was the cleaning lady who sent the threatening letter, but I wouldn't rule her out on the suspect list. Because people are not to be trusted... the only people I trust are dogs. You are desperate for your people, but it's hard for me to understand.