Recommended frequencies:

30 Days

  •  Wood or charcoal grills
  •  Char-broilers
  •  Restaurants open 24/7
  •  Some hamburger restaurants

60 Days

  •  Average restaurants
  •  Cafeterias
  •  Hotel kitchens
  •  Hospital kitchens

90 Days

  •  Hamburger restaurants
  •  Fast-food locations

120 Days

  •  Pizza parlors
  •  Convalescent hospitals
  •  Snack bars
  •  Oven hoods