Long-term use, you can take the following methods to remove oil stains: 1, use hot water and detergent, soak the old oily clothes in hot water for ten minutes, then add a proper amount of detergent to the hot water, and then scrub the clothes. 2. Mix hot water and salt with 80℃ hot water and salt, stir well, and then soak the dirty clothes with old oil stains with warm salt water. 3. Mix batter, flour and water to make a paste. Then, put the paste on both sides of the clothes and expose them to the sun. Remove the batter when it is dry, and then wipe off the grease. 4. Use toothpaste: squeeze some toothpaste and spread it evenly in greasy places. Gently rub in clean water to remove oil stains. 5. Use sugar. Wet the place stained with clothes first, then sprinkle a layer of sugar and rub it with your hands. At this time, you can see that the oil stains on the clothes are already on the sugar, and then wash them with clear water. The grease will disappear.