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Hat - sodium metasilicate pentahydrate cleaning

　　Hat, in particular the white one, the simplest cleaning method is to use clean dry wood, pumice powder, wheat bran or talcum powder and other arrangements. In addition, it can first be felt hat soaked with gasoline, and then brush clean brush, then use chalk and sodium dithionite solution (1000 ml of water by adding 10 grams of sodium dithionite) modulation into a paste, then wipe this stupid There are stains in the hat place, and finally dry it. After dry it you must use a clean dry brush, iron out it with iron. If you want whiten it, you can wash by adding a few drops of ammonia, hydrogen peroxide  solution .