Adjectives must agree in number and gender with their antecedents. "Cleanest" is le or la pluspropre in the singular depending on gender, and les plus propres in the plural.
Cleanest.
Pakistan is the cleanest country in the world
a dog actually has the cleanest mouth
The kitchen is the cleanest room in my house.
Anglais is English in the French language.
The Cleanest War was created in 1996-04.
"Feminity" in English is féminité in French.
Shania Twain only speaks 2 languages French and English
"Where?" in English is Où? in French.
"Out" in English is dehors in French.
"How?" in English is Comment? in French.
The second cleanest city in India is Surat after Chandighar.