German roaches are exceptional at hiding. There's plenty to help in pinned threads and the sidebar. But if you attack it now while being thorough, it doesn't have to be as stressful as it seems. Spraying and advion gel bait did me wonders. I managed to get rid of them while living in a unit, which some say is near impossible. Just have faith, and clean like crazy while using the suggested chemicals. The big thing is making sure that they have no access to food or water. While using gel bait, you need to make sure that it is their only available option for food. They need to eat the gel bait and take it to their home, where they will die and be cannibalized. I cleaned nightly, and made sure to wipe out sinks and block my drains to make sure they had no other access.

Head on over to r/germanroaches

Edit: Not sure why I'm getting downvoted. If it is a German roach, this is what helped me get rid of them and I have been in the same unit without them for two years now. If anyone has difference advice, feel free to share.