Superlative form of cleanly: most cleanly.(adjective)
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Use "cleanliest" in a sentence
"He says mass transit is the best way, and the cleanliest way, to get the city moving."
"His order did not permit him to wear linen, so that, having little occasion to undress himself, he was none of the cleanliest animals in the world; and his constitution was naturally so strongly scented that I always thought it convenient to keep to the windward of him in our march."
"Very good orators, when they are out, they will spit; and for lovers lacking — God warn us! — matter, the cleanliest shift is to kiss."