A clean-up operation was under way in Hong Kong Monday after a massive palm oil spillage from a ship collision in mainland Chinese waters clogged some of its most popular beaches. The coast was coated with rancid-smelling sticky white clumps of the oil as it washed in Sunday, with 11 beaches still closed to swimmers Monday at the height of a summer heatwave. There are still lumps of the solidified oil on the beaches and the sea water in some areas is greasy.