| abstract |
(57) [Summary] [Constitution] Cleaning of an object to be cleaned with oil adhered to the surface thereof, which contains at least one selected from pyrrolidones, γ-butyrolactone, N, N-dimethylacetamide and alkylene glycol alkyl ether and water. After ultrasonic cleaning with a cleaning agent, the cleaning agent adhering to the object to be cleaned is removed using water or hot steam, and then dried, and a cleaning method therefor. apparatus. [Effect] It is possible to efficiently wash oil deposits. |