No more Mr Nice Guy ! Look online for fumigation smoke bombs . Like a egg sized firework. You light a tab some sparks then it let's out a plume of fumigating smoke.
Open all wardrobes and drawers, close windows and doors , a towel around door bottom. Leave for a few hours.
Theres is also a spray to use from thd same supplier for residual effect
Toxic no doubt but its far better than cedar balls etc.