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Hard Water - Hard Surface Cleaner During the month of January, we performed a test to measure removal of hard water deposits from glass and black ceramic tiles. The object was to rank different experimental and commercial hard surface bathroom cleaners for performance. Similar tests were run with soap scum. The tiles were cleaned thoroughly, and then sprayed with a naturally occurring very hard water (collected from Franklin Lakes, NJ). The tiles were placed in a circulating oven until all the water evaporated leaving behind the mineral deposits. The process was repeated until a suitably heavy deposit was formed. The soiled tiles were placed in the Gardner Washability Machine; a specific cleaner was applied to damp sponges and the tiles were scrubbed and distilled water was used to rinse the tiles. After drying the tiles, the amount of soil left on the tile was measured using the Colorgard System/05 Reflectometer and compared with soiled and unsoiled tiles. Photographs of the glass tiles were taken for visual and demonstrative differences and can be seen below.
We found that controlling the amount of soil was critical to reproducibility. The original tiles had to be exactly matched. Orthogonal design of the experiment with tiles sorted by reflectance was necessary. Careful control of the amount of cleaner, number of cleaning strokes and cleanliness of the original tile was also important. Three repeat runs and three measurements of the cleaned area gave enough data to allow good discrimination between products by statistical analysis. |
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