How do I get a clean version of a song?

Could you please elaborate on the process of obtaining a clean version of a song? Are you looking for a version without explicit lyrics, or perhaps a remastered audio quality? Are there any specific tools or services you've heard of that might assist in achieving this? Additionally, do you have any legal concerns or considerations in mind, especially if the song is copyrighted? Clarifying these points will help me provide a more accurate and informative answer.