They don't list the ingredients on the label but it appears to be rubbing alcohol, salt, and blue coloring.
Isopropyl alcohol causes serious belching and can kill in high doses.
That said, winos drink it all the time.
They hit the E.R. with serious, stinky belching, but it rarely kills them.
The LD-50 is a tad worse than ethanol and the symptoms are similar.

As for your neighbor.
Most cat poisonings are from propylene glycol, (Anti-freeze), that gets left out in open containers.
It has a sweet taste, cats seem to be attracted to it.
What I'm saying is;
"Never attribute to malice that which can be attributed to stupidity."

Best wishes
Weeze