| 摘要 |
An aqueous solution containing at least either a carbonate or bicarbonate of an alkaline metal, such as sodium bicarbonate aqueous solution is electrolyzed, and the obtained electrolysis solution is used as a cleaning undiluted solution. In this electrolysis step, sodium bicarbonate aqueous solution is fed into at least an anode chamber of an electrolyzer having a cathode chamber and the anode chamber partitioned by a diaphragm, the solution is electrolyzed, and the obtained catholyte or anolyte is used as a cleaning agent undiluted solution; or sodium bicarbonate is fed into both anode and cathode chambers, the solution is electrolyzed, and the catholyte is used as a cleaning agent undiluted solution; or sodium bicarbonate aqueous solution is fed into at least the anode chamber, the solution is electrolyzed, and sodium bicarbonate is further added to and dissolved into the catholyte or anolyte, and the obtained solution is used as a cleaning agent undiluted solution; or sodium bicarbonate aqueous solution is fed into at least the anode chamber, the solution is electrolyzed, and the obtained catholyte and anolyte are mixed after the electrolysis, and the mixture is used as a cleaning agent undiluted solution.
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