In 1997, we had Gemma Property Services to kill cockroach in our apartment, the gel was very effective but when I asked the guy where I could buy it ( for my sister in China ), the guy told me that the gel wasn't on the market for people to buy and to use by themselves, people could only use certified services like theirs if they wanted the cockroach to be killed. I don't know if things have been changed.
Yes. Maxforce is very effective.
Once roaches eat the gel, it stops the reproduction.
According to the exterminatrion store, it is only sold to the professional.
Too bad the store is now closed.
Check the phonebook, if anyone bought one, let us know.