Ultrafine bubbles cleaning device (80) is a liquid that size contains ultrafine bubbles of less than 30 nm, is intended to separate and recover wash away fine particles attached such as soil and sand, reservoir aquarium shapes ( and 82), the reservoir being disposed in a central position (82), reservoir and (82) stirrer for agitating the liquid in the (84), above the liquid in the reservoir (82) supernatant discharge device including a pump for discharging the supernatant and (85), is configured to include the reservoir with the precipitate removal device for removing the precipitate separated was precipitated on the bottom of (82) (86), the have been, the object to be cleaned is introduced, such as reservoir (82) earth and sand ultrafine bubble-containing liquid stored in, by the stirring device (84) an ultra-fine-bubble-containing liquid to be cleaned surfaces It was repeated contact, metal adhering surface or cracks in the object to be cleaned, dents and the like particle Metal containing ions) and a solvent, the drug, the organic fine particles such as oil, to float separated by ultrafine bubbles from entering between these and the object to be cleaned.