| 摘要 |
PROBLEM TO BE SOLVED: To provide a cleaning agent and a cleaning method which can clean an item such as a heat exchanger or a piping that is deposited with a rigid scale containing a silicate in a short time without using a fluoride having high harmfulness. SOLUTION: This invention is a scale cleaning agent which comprises (A) one or more components selected from the group consisting of hydrochloric acid, sulfuric acid, phosphoric acid, sulfamic acid, oxalic acid, citric acid, gluconic acid, malic acid, tartaric acid and their alkali metal salts and (B) one or more components selected from the group consisting of phytic acid and its alkali metal salts, and which has a pH less than 7. COPYRIGHT: (C)2005,JPO&NCIPI
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