So, did everything the landlord told me to do to prep my studio for the exterminators, they just don't treat personal items and it basically said you gotta treat your personal shyt yourself, so unable to treat/keep sealed there, I brought my violin (in its case), a backpack, and a duffel bag.

The backpack and duffel bag I sprayed with some spray my mom had got for fleas that said it works for bed bugs too and stuck in a plastic bag a bit and then air dried in the sun and then stuck back in and sealed. (Backpack is very colorful so it'd be difficult to do a visual inspection, duffel bag has a lot of crevices and compartments so ditto.)

The violin I took out, checked, didn't see anything suspicious, the case was dirty as hell so I couldn't tell and just vacuumed it first and then test sprayed it with the same stuff, made sure it wasn't damaged, then sprayed the crevices again and aired it out.

How can I be 100% sure I'm not bringing back anything that's going to re-infest my apartment? (no way I'm paying hundreds of dollars for them to come back if I can help it)



(extra background info just for the extent of the the problem):
Through all my cleaning I only ever found one adult bug, but I think as soon as something came in I got bit the first night by younguns and noticed (a lot of nymph looking specs around though), and the next day my landlord got an exterminator to confirm the one adult bug I found while manically searching was a bed bug, and two days later/yesterday they were able to go in and treat. While laundering all my clothes I never found anything of significance (shells, etc.) in the machines/lint guards afterwards.