We don't have synonyms for deep clean yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are deep ocean.
(n) :
Any thorough cleansing, especially one conducted in order to disinfect a place that has or may have been contaminated with a disease vector such as a virus, bacteria, etc.
(n) :
Any thorough cleansing, especially one conducted in order to disinfect a place that has or may have been contaminated with a disease vector such as a virus, bacteria, etc.