Tank cleaning equipment

Tank cleaning equipment comprises at least one vessel 2, 4 having a liquid outlet 22, 23, suction inlet 20, 21, and suction outlet 16, 17, the arrangement being such that, in use, cleaning liquid is sprayed into a tank from one of the vessels and the used liquid is recovered by suction and stored in the vessel. The cleaning liquid may be passed through a heat exchanger 12. The equipment may be mounted on a trailer, and may be used for cleaning rooms, roadways, or buildings. <IMAGE>