Section 114111 Of Chapter 5. Cleaning And Sanitizing Of Equipment And Utensils From California Health And Safety Code >> Division 104. >> Part 7. >> Chapter 5.

. (a) If used, dry cleaning methods such as brushing, scraping, and vacuuming shall contact only surfaces that are soiled with dry nonpotentially hazardous food residues.
  (b) Cleaning equipment used in dry cleaning food-contact surfaces shall not be used for any other purpose.