CLN is a unique word, so it doesn't actually have synonyms. However, it could be associated with terms relating to cleaning or cleanliness. For instance, tidy, hygienic, spotless, pristine, immaculate, sanitized, and polished are all adjectives that describe something clean or neat. Alternatives to "CLN" could be abbreviations or codes for various cleaning products like Windex or Lysol. Additionally, it might be used as an abbreviation for different cleaning services or companies since there isn't a specific definition for this acronym. Overall, while there aren't any direct replacements for "CLN," there are numerous words that signify the idea of being clean.