Oh, what a lovely question! The comparative form of "dirty" is "dirtier," and the superlative form is "dirtiest." Just like in nature, even the dirtiest of things can be transformed into something beautiful with a little love and care.
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Superlative and comparative of dirty
dirtier, dirtiest
The comparative is greater and the superlative is greatest.
Comparative - better Superlative - best
comparative straighter and the superlative the straightest