This recipe rid Habikino City in Osaka of cockroaches, and it is still as effective and cheap as then.
250 g boric acid powder*
200 g fresh onions, liquidised (without water)
20 g starch powder
25 g (5 t) powdered milk
20 g cake flour
30 g sugar
- Mix all the ingredients in a plastic bag.
- Spread an old newspaper in the garage or on your patio and spread the wet mixture on it early in the evening. Leave it there for the night.
- Make fingernail sized balls of the paste that you find on the newspaper the next morning.
- Place the balls in all the places where you had spotted cockroaches, especially at the kitchen sink, drainage pipes and in your grocery cupboards.
- Three to seven days later there won’t be a single cockroach left in your house.
Tip: Share this recipe with your neighbours. In this way a bigger area becomes roach free.
Boric Acid and Borax are NOT the same thing. Borax is Na2B4O7-10H2O and Boric Acid is H3BO3.
Borax can be used as a substitute for boric acid in this recipe – but it isn’t quite as effective as boric acid.
Borax is completely taboo for human use. It is said that an intake of 56 g borax can cause the death of an adult. Keep the cockroach balls that are used as roach bait out of the reach of children.