I have been an exterminator all my life. My dad had a pest control business and I have since 1989... so. If you have any questions or need any help I can tell you where to look, what to get, and how to use it. Do not spend ANY money without talking to me first.
If you have German roaches you cannot get rid of them with spray. Fogging will drive them deeper into the walls. Fogging and spraying will look impressive BUT... and this is a large aft... the German roach breeds so fast that you can kill 90% of them and have more than you started with in 30 days.
Some rules.
~NEVER bring used furniture or appliances into your home without first inspecting and treating them.
Actually that is the only real rule except to NEVER try to control German roaches by spraying them. You can get bait or I can get bait for you at about half price and I do not mind doing it.
If you have them in a computer, microwave, coffeemaker, or other small appliance like an office phone (they like the heat and ants will also nest in and under small appliances). Take the microwave or whatever it might be, put it in a black garbage bag and set it in the sun. Obviously this wont work is it is 20 degrees outside but if it is reasonably warm the black bag closed up will generate enough heat to kill everything without harming the electronics.
Now... to see if you still have any roaches. Pull out the kitchen drawers in the area where the most sign is. Set the drawer on the counter, lay on the floor, stick your head in the cabinet and look back up near the front of the cabinet with a flashlight. They tend to go up and toward the front. You can also put a light puff of any flying insect killer behind or under the fridge... very little and be aware it is deadly to birds and reptiles and fish are very sensitive to pesticides.
Don't buy the bait without talking to me. You can also use a gluetrap to monitor for roaches. If you don't have one make a ball of clear tape or a piece of duct tape with a little tad of peanut butter on it. Just put it in the area over night.
Roaches are VERY sensitive to changes in air pressure and will run for the cracks as soon as you start moving around. If you see a few you likely have a lot more UNLESS they are the big roaches (Smokey Brown or American roaches) like you see in Florida etc. German roaches are caramel colored and they do not fly, their wings are shorter than their body. The Wood roach looks almost identical but it flies and the wings are onger than the body. The Oriental roach is more associated with sewers and water meters.
I hope this helps and REALLY... don't call an exterminator. I can get you through this WAY cheaper and you can do it. If you find roaches and you can.. take a picture or two.
Let me know. I promise, I don't mind helping and will help. It is one thing I am really good at.
J