Why are grease stains so hard to remove from clothing?
 grease and oil that is removed from clothing during a washing machine’s wash cycle is often deposited on the inside of the washer’s drum [4]. The deposits of grease build up with repeated washings of greasy clothes. They become resistant to removal by detergent and hot water during the washer’s regular wash cycle [4]. To remove grease stains, first lay your clothing on a flat surface [3]. Place an old towel, old cloth or cardboard exact under the stain of grease [3]. Now Apply a small amount of laundry detergent to the hard grease stain [3]. Rub the laundry detergent gently with a soft cloth to saturate the grease stain [3]. Let the detergent sit on cloth for around 5 minutes [3]. Wash your cloth in hot water now with your hands or washing machine [3]. Finally dry the cloth according to the clothing label directions [3].
Grease stains are hard to get out of clothing because they can be oil or grease based and the grease doesn't break down with water alone [2]. You can use a combination of detergents and hot water to remove the stain if it is a grease or oil stain [3]. To remove the stain, use a dull knife or spoon to scrape the grease or oil solids off of the stain [3]. Blot the stain with a plain dry white paper towel to remove the remainder of the grease or oil [3].