There are various types of standards are followed in hotels:

PHYSICAL CLEAN:

When this standard is set the area or surface is supposed to be free from the dust and dirt as when wiped by hand.

CHEMICALLY CLEAN:

This standard means that the area should be free from harmful chemicals on the surfaces and in the surrounding air.

BACTERIOLOGICAL CLEAN:

The surface should be cleaned so as to be free from any harmful bacteria that may cause disease or infection.

ENTOMOLOGICALLY CLEAN:

This means the area should be free from harmful insects and/or pests.

TERMINALLY CLEAN:

This refers to the standard of cleaning usual in operation theatre and intensive care units in hospitals, where surfaces need to be constantly sanitized.