Dirty
The opposite of polluted is clean.
clean
Clean
The opposite of messy is tidy or neat.
The opposite word for "kalank" in Hindi is "shudh" which means pure or clean.
plain, unencumbered, clean, casual
mean or green for moss
Bald, or 'clean-shaven' should do.
The word "pure" is often used as the opposite of contaminated. It implies that something is clean, uncontaminated, or free from impurities.
Dirty
One word would be "immaculate" (spotlessly clean).
For a stain that means a dirty spot, the opposite is clean. For stain that means to a person's character, the opposite is praise.