Among the data of cleaning which come out in the text-books of junior high school there are some revising points according to the progress of domestic supplies and machineries. In this paper dealt with the ratio between washing solution and washing cloth, washing time, and concentration of detergent. 1. Ratio between washing solution and washing cloth. Examined the ratio following to the JIS C 9606-1918 method, using three brands of cleaning machine. Experiment was carried out after adjusted the ratio to 1:10, 1:15, 1:25, and 1:50 and as the result the difference of cleaning efficiency between 1:10 and 1:50 was 10% by strong-stream, 15-20% by medium-stream, and almost no difference by weak-stream. 2. Washing time. Washed for 5, 10, 20, and 30 minutes following to the same method just mentioned above (1). As the result the cleaning efficiency increased by long washing time, but 5 minutes washing by strong-stream resulted the same or higher cleaning efficiency to 20-30 minutes washing by medium-stream or weak-stream. 3. Concentration of detergent. Examined the effects of concentration applying eight marketing synthesized detergents. As the result proved that there exist no significant differences of cleaning efficiency between each brand of detergent. On the efficiency of cleaning no variance existed concerning 0.14-0.5% solutions.
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