What is this? Mystery item guesses needed...

[MrsPatrickDempsey]

Found two of these loose in the washing basket. No one claiming to know what they are. Any ideas?
Hard in consistency but ever so slightly pliable (could leave dent with finger nail) No smell - haven't tasted 😂 Looks a bit like a dishwasher tablet.

Soap?

Looks like a TicTac box?

One of those cleaning things you put in the loo cistern?

Like this

Harpic is a good call. I'd have said plasticene / fimo.

How big?

I was thinking tictac box as well.

What does it smell like??