For us (I say us because a roommate brought them into my own home) "products" didn't work - there's not an effective spray or poison AFAIK. Lots of common bug sprays kill them on direct contact, but that helps little because of the hidden ones and their hidden babies/larvae. Heat works, but if you're providing/imposing solutions on tenants in a separate dwelling, I think that even more than I did, you'll find that structurewide non-DIY heat is the only sure thing.
I am aware of 3 ways of applying heat that work locally, meaning in a particular spot or object, but victory in the local battle didn't win the war.
-bagging up items and heating the sealed bags. Plastic garbage bags in the Texas sun work fine. 130 degrees Fahrenheit for 4 hours is plenty.
-hot water in washing machine and properly tuned hot cycle of dryer for clothes
-steam machine. Must be applied at a rate that kills them without blowing them around; not too fast, not too slow. Maybe a half a linear inch per second. Make sure to cover all baseboards and floor seams.
Several attempts by roommates panicked about cost were performed with manual methods, meaning picking them by hand out of bed corners, drapes, and furniture corners and then killing them with bug spray in a collection bowl before disposing in a trash bag. Said roommates were sure these methods worked, but they didn't stop the cycle. Finally I put my foot down, insisted on full compliance with exterminator instructions, and paid the pros a four-figure sum. I wish I'd done it sooner.