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Tifu by buying a colony of baplica dubia roaches online(r/tifu)
Combat does next to nothing now and neither does Raid. If you prefer to go the gel bait route, I whole-heartedly suggest you use Advion Cockroach Gel Bait. It kills up to 5 generations.
I had an absolutely terrible infestation from moving into a cheap trailer 40+ years old. Had nests of them. They would run across the floor in broad daylight. Even the exterminator told me we’d never get rid of them in this house and our best bet would be to try and control the population with monthly spraying and setting out glue traps regularly throughout the house. Basically milking us for $50 every month.
I refused to accept his answer and went online. Found advion and gentrol. I will add a link for them on Amazon. Basically the Advion is commercial/food grade gel for whole apartment buildings, hotels and restaurants. Use it just like combat. I will advise putting it out away from cats as it’s toxic to them. It is technically safe for kids but would cause diarrhea and upset stomach.
They FLOCK to it. Don’t be surprised if you apply it and it’s gone within 20 minutes. They have just enough time to make it to wherever they are building their nest, then they die. Roaches are cannibals so the others will eat the dead one. The bait will continue to work for up to 5 cycles of cannibalism.
Along with that, use the gentrol IGR stations. They are basically roach birth control. You stick them in various places, break the tube containing the product and it works up to 75sqft. Any roach that walks in that 75sqft area will be rendered sterile. These stations last for 3 months.
The 2 methods used together will 100% eradicate your pest problem. It make take a few weeks to a month but it WILL work and you’ll have a massive, rapid die-off in the first week.
Source: home is the only roach-free home in our neighborhood.
Advion Syngenta Cockroach Gel Bait 1 Box(4 Tubes) www.amazon.com/Advion-Syngenta-Cockroach-Bait-Tube…
10 Gentrol Point Source IGR Insect Growth Regulator Discs~~ Half Box~~ ~~ Control German Roaches and other Cockroaches as well as Stored Product Pests… www.amazon.com/Gentrol-Regulator-Discs%7E%7E-Contr…