Sweat the small stuff - It's all in the details
Minimising risk requires us to understand the bacterial lifecycle and building your hygiene processes around this. The first point to consider is that bacteria spores are tough - really tough. Bacteria rest until they are reactivated by humidity, warmth, or most significantly, a food source. Many species are extremophiles and can survive in climates of less than 10% humidity, some thrive in radioactive waste, or around hydrothermal vents in the depths of our oceans. The fact is, when we first detect life beyond this planet, there is a good chance it will be bacterial.
A welcoming environment
This presents a challenge for food manufacturers, dealing with organisms that have a determined grip on life and are invisible to the naked eye. Moreover, we present them with their ideal living conditions - food and warmth. This is where the problems start: in a nutrient rich environment, a bacterium grows and when it reaches an optimum size it splits. This process continues exponentially, and a colony can double in size roughly every ten minutes.
Clearly, the best bet is not to allow bacteria to gain a foothold in your facility. However, this is often easier said than done. Bacteria can enter via dust motes or can survive for weeks on dry clothing, subsisting on sloughed skin cells. As such - and this should go without saying - clean staff's workwear regularly and do not allow anyone access to areas of the facility where food is present unless they are appropriately attired.
Given the tenacity of bacteria, prevention will only go so far and the emphasis should be placed on cure, which means continual and unrelenting cleaning. Regular and thorough cleaning processes have to leave no place for bacteria to hide and develop.
Before implementing a standard operating procedure, consider where bacteria could live. Every piece of furniture or equipment should be risk assessed for trap points - areas where food detritus or dirt could collect that bacteria could live on. Remember, bacteria are very small indeed, so even a ledge or gap of 1 mm will constitute a risk.
While we cannot really envisage how a bacterium perceives the world, we do know that their movements don't end below where a human can comfortably bend.