This job is huge, and it isn't medicine. You have some money, some high end machinery, and kilograms of chemical compounds that are pretty hard to come by. You can afford to hire a cleaning crew for this mess. While they're cleaning up the main lab you can start some exploratory work out back in the woodshed.
You look in the book and call the most expensive cleaners in town. You schedule them for next week, which gives you a week to find everyone on the crew and get the memory drugs into their systems one way or another.
When the crew shows up you bribe the foreman about three times the normal price for the job and you send them downstairs, eyes blank from the memory drugs. Later on they won't remember anything except that they did a job today. You have the whole day to yourself now.