There are a few different fancy words that can be used as synonyms for “clean”.

Here are a few examples:

• Sanitized: This word refers to the process of making something completely clean and free of germs or bacteria.
• Purified: This word refers to the process of removing impurities or contaminants from something, leaving it clean and pure.
• Decontaminated: This word refers to removing harmful contaminants or toxins from something, making it safe and clean.
• Immaculate: This word refers to something that is spotless, with no trace of dirt, dust, or other debris.
• Pristine: This word refers to something that is in a state of perfect cleanliness and condition as if it were brand new.
• Sterilized: This word refers to eliminating all bacteria or other microorganisms from something, leaving it completely clean and germ-free.

These are just a few examples of fancy words that can be used to describe cleanliness. The choice of the word will depend on the context and the level of formality required.