If a hygiene policy had a general statement that said:
Before entering the factory all personnel, visitors and contractors must wash their hands using the antibacterial hand wash at the hand wash basins. Hand washing must also be carried out after visiting the toilet, after breaks and after smoking.
Hands must be washed after any task where the hands become soiled or contaminated.
Then an obedient and dutiful engineer would wash their hands every two minutes after every single task.
So you could change the statement to say.
Hands must also be washed before handling product if they have become soiled or contaminated.
Do you think that would help the engineers to not get sore hands caused by all of the washing?