Ah this is an easy one. It’s a bit like my recipe for table candles: you pour wax on the table and set it on fire. Here though, you simply spray the corners with pure ethyl alcohol and set them on fire.
No, seriously, good hygiene is a matter of good surfaces. If the lab floor and walls are tiled with porcelain tiles, then it’s easy. Any good disinfectant will do the job.
If you do end up with mushrooms in the corners, check them out and if they are red with white spots, send them to me.