There are many safety and cleanliness rules and standards that cruise ships must follow. They must also post USPH Signs all over the ship to show inspectors that they are at par with industry standards. Here are some rules that need signs:
Personal hygiene – Wash hands always for 20 seconds. Wash hands every time when entering or leaving a food or beverage preparation area.
No illegal or dangerous practices – Never take any utensils, plates, glasses, equipment or food to your cabin. Never store any equipment in an area used for something different.
Labelling – All cleaning chemicals must be clearly labeled and color or number coded.
Separation – Clean dishes, utensils, silverware, etc. must never be in the same place as dirty ones. Always separate.