You just get a bunch of the beetles, let them do their thing, most of them will fly off or die out, but whatever... they're ladybugs. Once they have had a chance to decimate the population to just a few then you'll have a pretty good grip on them.
The only way I know of to effectively remove them from a room, for good, without a chance of return is the use of CO2. You literally suffocate them at 5,000ppm (5%) CO2. You take the CO2 up to that 5,000 to 10,000 mark and leave it there for 20 minutes. Do this every other day for 10 days. This will completely eradicate nearly every pest. The plants aren't going to die, but it's not like they love it either. It is a good idea to do this during the night period when respiration rates are lower and the CO2 increase doesn't do too much harm.
Barring that there is really very little you can do to find and kill every last egg, larva, and mite running around that place. It only takes two of them to replicate to ungodly levels.
It is unfortunate... but I personally would probably trash the entire grow room once you harvest everything in there. Wash what you can in bleach, walls, floors, lights, fans. Throw away all the coco and planters and harvest all the plants. Clean it out completely and start fresh from seed, do it yourself and do it right, maybe you'll manage to save up a little cash between then and now and make some improvements also.
Sucks so hard... Damned Borg. Fucking Replicators. Glad to hear that the sprays are working but you really need to keep an eye on those eggs. I'd wipe them off with a wet paper towel personally.