pre-Chinese New Year clean up (noun), cleaning for Chinese New Year (verb)
Definitions (粵典–words.hk)
動詞
徹底噉清潔、打掃屋企；多數都係講緊年廿八打掃屋企嘅農曆新年習俗（量詞:次） to clean thoroughly; to do a thorough clean-up esp. on the 28th day of the twelve lunar month in order to receive the new year
Definitions (Wiktionary)
verb
to do a general cleaning (especially one at the end of the year); to do a houseclean; to do spring cleaning