Silicone sleeve grease should be coated with soapy water, wipe the stain with a soft cloth, and then rinse with water, wipe the water with a napkin or a soft cloth, and put it in a cool ventilated place to dry
1, the advantage of silicone is cheap, the disadvantage is that it is easy to turn yellow, not suitable for cleaning, almost belongs to disposable consumables, stain removal liquid or bleach suitable for tea, coffee or other stains, use an eraser to wipe with alcohol, or apply some toothpaste to clean, with transparent glue or tape
2, here is a warm tip, silicone phone cover must not be exposed to the sun, in addition, do not clean too frequently, will backfire, I believe you will not throw away the next time the phone cover turns yellow, try these methods, can make your phone cover look new