Vacuum tank trucks clean grease traps, septic tanks, sewage, and manholes.
Use a pressure washer to clean the remaining oil stains.
According to the Hong Kong "Food Hygiene Code", Grease traps should be regularly inspected, and there is no leakage or chokage.
Waste water from food premises carries a large quantity of grease, which
should be removed from entering the drains or sewers to prevent clogging when it gets
into them, solidifies and accumulates there.