I can’t actually see the item you’re referring to, and from what you’ve written it sounds like one of those clickbait-style posts (“check the first comment for answer”).
If you want a real identification, I’ll need at least one of these:
- a photo of the object
- a description (size, material, smell, texture, where exactly in the bathroom it was found)
Without that, it’s impossible to figure out what it is, and those “answer in comments” setups are often just engagement bait.
If you upload or describe it, I can help you identify it properly.