1, with a soft toothbrush (must be a soft toothbrush, hard I have not used so do not recommend you to use), with a toothbrush dip in water and then rub on the soap, then the toothbrush will be covered with soap.
2, and then wipe on the shell, do not worry about not fading very damaged shell, wipe time a little longer, otherwise the black edge of the shell is very stubborn.
3, then wash clean with water, and then brush, when in the brush at the same time the foam has been white is not turned black to wash away.
4, with clean water, the shell is basically new, so that the dirt of the phone is removed.
Use an old toothbrush. Squeeze some toothpaste and brush the phone case, all the sides and corners of the case.
Use vinegar and baking soda.
Put a little toothpaste on the top of the phone case and sprinkle in just enough baking soda and salt.
Use dish soap and alcohol.
Mix dish soap and alcohol thoroughly and stir well, then put the phone case in to soak.