Caustic soda is a strong base, corrosive, causing damage to the skin, and releasing high heat when dissolved in water.
Many of the current washing powders contain this substance.
Both washing powder and detergent are water-soluble and can be dissolved at a certain saturated concentration. When the saturated concentration is reached, it can not be dissolved. In order to increase the solubility, it can be heated.
The oil in the kitchen is diluted with simple detergent or detergent and water, preferably hot water. The surface of the tile has a layer of paint, which can resist the corrosion of weak acid and alkali such as laundry detergent, and can be used with confidence.
To remove oil stains: chop the soap with boiling water and then wash the oil to wash off the oil. If the oil is not too big, you can use the chewed sugar cane to remove the oil. When you remove the oil, you can wash the color with gasoline or carbon tetrachloride. The oil stain can be washed first with alcohol and then with detergent ammonia. If there are still residues, it can be treated with enzyme preparation.