Chemical or bio-fogging has been around a long time as a way of sanitising interior spaces in buildings. But what once was a highly specialised (and costly) cleaning technique for clean rooms, hospitals and the food processing sector is now seeping into the mainstream.

The fogging process is rapid and efficient. FMs will probably be aware that formerly, an area might be sealed off for days at a time for fogging. Now sanitisation takes a matter of minutes. To avoid disruption and risk of allergic reactions, areas do need to be clear of people. So it should be done outside of working or opening hours, overnight for example.