The Cantonese rendition of the line of calligraphy reads: bo chi lau yue gung yung dei fong ching git, which, accompanied by the amusing illustration, is a creative appeal to apartment building residents to keep their shared spaces clean.
Essarem notes that the dating of the above image is based on the fact that it appears on the pages of a Hong Kong guidebook that was published in 1991.
Date picture taken
1990 (year is approximate)