Bicarbonato is available at any Chino Supermarket
My building has serious cockroach infestation, despite the fact that the exterminator comes once a month.
I tried everything sugar mixed with
bicarbonate, a special gel from the hardware, a spray can that creates a vicious fog, (must empty the apt,) Gamesan tablets that create a dense fog. The fog contaminates, clothing, bedding, china, etc.
Nothing works you must hire a different Exterminator and fumigate twice a month in the beginning then once a month The Guys that fumigate the building use water....
if they eliminate the roaches they would be OUT of Work....
I don't let them IN...!!