This recipe is one of the best to get rid of cockroaches. Out of all the variants I've tried, this is the most effective. It’s simple to make and you only need everyday household items.
The fresh onion is what really makes this recipe. Cockroaches are attracted to onion so the balls will start working immediately. But as the onion starts to decompose it continues to attract cockroaches. The balls also help to slow the decomposing so they’re effective for quite a while.
15 minutes (+ drying time)
- 200g of boric acid
- 1 medium onion (You can use onion flakes but they’re not as good)
- 1 cup of flour
- 1/4 tsp of salt
- About 100ml of milk
- Metal or ceramic mixing bowl
- Spoon (not wood or anything porous)
- Kitchen gloves
- Finely chop up the onion.
- Mix together the boric acid, onion, flour, and salt
- Add enough milk to the mixture to make it all come together into a dough. Pie crust consistency.
- Roll into 1-2cm balls. The larger size last longer and are a bit more effective as it contains more onion. The smaller size is better for placing them in smaller spaces. Sometimes there’s not a lot of space behind fridges and dishwashers.
- Place them on wax paper and allow them to dry. You could place them like this, but they’ll be sticky and will stick to the surface. Something you’ll have to clean up later.
Where to place them
These are not edible. Do not place them where children or pets can reach them.
- Behind fridges
- Behind dishwashers
- In corners of cupboards, cabinets and drawers
- Under furniture
- Under stoves - just need to be careful that the region doesn’t get too hot. Otherwise the balls will cook.
- Along floor boards
- Around the garbage
- Behind flower pots