You may not detect their presence in your apartment for months while their population grows.
It is nearly impossible to eradicate them, including their eggs.
Hidden breeding areas outside your unit, including those of your neighbours.
Roaches leave traces of fragrance wherever they find comfort, so if a new one enters the compound, they will be drawn to your apartment even if you have recently killed all (though this is unlikely).
Long answer:
You can control cockroaches to submission, but it requires a great deal of work and dedication for several months.
Good suggestions above, pesticides like SNIPER all over your house and flushing in toilet, that will ruin breeding grounds, but you must keep doing that every few months. But in your apartment, keep “SNIPER” recommended above at all corners, at all times.
Preventing cockroaches from entering your home
Blocking all cracks and flat spaces in doors, windows, ceiling, etc., Anywhere leading to your apartment from outside.
Never leave leftover foods in the open, including crumbs that may drop to the floor, in fact, it’s best to take them out of your apartment ASAP.
Empty your waste bin at least once a day roaches are particularly attracted to fermenting food, so take note.
Use sodium bicarbonate to get rid of “cockroach scent” at hiding spots in your apartment, especially in between stacked pots/bowls you don’t use often.
DANGER OF SNIPER COCKROACH INSECTICIDE:
SNIPER IS VERY POWERFUL, use it undiluted and close all windows and doors overnight. DO NOT STAY OR SLEEP IN THAT APARTMENT UNTIL YOU LATER VENTILATE IT FOR HOURS. But you might also consider industrial fumigation which is more expensive.
Disclaimer: We are not pest expert, we will not take responsibility for any outcomes if you follow them. Keep sniper out of reach of children and do not sleep in the room unless you’re sure the smell is out.
WHERE TO BUY SNIPER EFFECTIVE INSECTICIDE IN SOUTH AFRICA?