It is common practice to make the slug all lowercase, accented characters are usually replaced by letters from the English alphabet, punctuation marks are generally removed, and long page titles may also be truncated to keep the final URL to a reasonable length.
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Typically clean URLs use rewrite rules to select which script (if any) to run, rather than putting the name of the script in the URL.
Clean Water Act | Clean Air Act | URL redirection | Clean Air Act 1956 | URL shortening | The Clean | clean and jerk | A Clean Escape | Mr. Clean | Clean Ponds | Clean Air Act (United States) | 8-bit clean | The Clean Tech Revolution | The Clean Air Campaign | Sam "Squeak E. Clean" Spiegel | Not Completely Clean | Kiss Each Other Clean | Eddie "Clean Head" Vinson | Clean Water Network | Clean Water Action | Clean Up the World | Clean-up | Clean Sweep | Clean Slate Program | Clean Skin | Clean: Overcoming Addiction and Ending America's Greatest Tragedy | Clean House | Clean (film) | Clean Edge | clean coal |