What aspect of personal cleanliness is most critical in preventing a hazardous condition by contaminating food products?

The correct answer is hand washing. Hand washing is the single most important way in preventing the contamination of food products (for food industry worker) and the most effective way of preventing the transfer of infectious organisms in the workplace. Hand washing is proven to be effective in personal cleanliness. 

This movement is also referred to as  glacial plucking

Ascience cannot answer religious question