Cleaning solution alternatives and what to avoid

I just bought omni x8 pro and I saw post when user telling that the official cleaning solution not anti-bacterial and build bacteria on the mop. is that true?

anyway it seem hard to find so I wonder if there an alternative.
The main reason I'm hesitate is that I might damage the unit.

So what materials should I avoid when trying cleaning alternatives?

Do you know of post or cases when people did damaged theirs robots using non-official solutions?

thanks