1.Use toothpaste when ink infiltrates.
2.Such as stained with soy sauce, vinegar and other available Jie Ling Ling.
3.stained with rust stains, lemon juice can be freshly squeezed rust stains repeated rubbing, then wash with soap and water. Also available dimension C instead.
4.Stains such as tea, with sodium hydroxide or potassium bicarbonate and other soda solution can be removed.
Note: When dealing with the board brush, do not use steel balls, or will scratch the exterior appearance of polished tiles.