Distribute the paste on the ceramics, and leave it for several minutes. Scrub the dividing lines of the ceramics with a brush. Wash the ceramic with water, then dry it with a clean towel. The second method is done as follows: [3] Mix baking soda with an amount of water until a sticky dough is formed. Distribute the paste on the dirty spots, and leave it for a minute until the stain absorbs it.
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