Cleanliness

Cleanliness is a virtue, as it tends to contribute to general good health.

But how does one ensure "cleanliness"
- in food served at restaurants?
- in food packaged for sale at supermarkets?
- in food meant for consumption by certain cultural and religious groups?

More questions ...

- How do you define "clean"?
- Would you consider food prepared in a "5-star" restaurant as clean?
- Would you consider food prepared by a roadside vendor as not-too-clean?
- Would you consider utensils used in a "5-star" restaurant as clean?
- Is a frying pan clean after it has been washed with detergent - after use in cooking?
- Is a frying pan clean after it has been washed with detergent - after someone urinated in it?
Would you have any problem eating food cooked in this frying pan,
if you are aware of its prior (mis)use?
- Is a halal (kosher) restaurant still halal (kosher) if its employees regularly eat and touch
non-halal (non-kosher) food elsewhere?

Questions ... questions ... questions ...
Has anyone any answer(s)?