Article in English: Fill up a plastic container halfway with warm water from your faucet. Add 3-5 drops of dishwashing liquid or Castile soap, and mix it up with a spoon. Then, place your derma roller in the container upside down. Soak your derma roller for 10-20 minutes. This gets rid of any surface blood or skin cells. Derma rollers have many small needles that poke into the pores of your skin. Dirt, blood, and dead skin can get trapped in between the needles. For a deep clean, use a new, clean toothbrush with soft bristles. Turn on warm water, and hold your roller underneath the stream. Brush your roller gently with your toothbrush for about 60 seconds.  This gets rid of dirt and residue that alcohol or soap may not lift off. While this is optional, it provides a deep, thorough clean. If you use a used toothbrush, you can spread bacteria to your roller. Place the wet sponge on a clean, flat surface. Then, move your roller back and forth across the top of the sponge. Do this for 20-45 seconds to get rid of dirt and residue that other methods may not remove.  This is optional, though it is a good idea if you frequently use your roller or have an older roller. Use a new, clean sponge to avoid contaminating your face. Use warm water from your faucet to wash your roller off and get rid of any dirt, skin, blood, or debris that came loose when cleaning it. Then, place your roller upside down on top of a clean paper towel. Your roller should dry in about 10-20 minutes.

Summary in Vietnamese:
Ngâm cây lăn trong nước xà phòng khoảng 20 phút để làm sạch bề mặt. Dùng bàn chải đánh răng mềm, sạch nếu bạn muốn làm sạch bụi đất hoặc cặn bẩn. Lăn cây lăn kim trên miếng bọt biển ướt để loại bỏ các mẩu vụn còn sót. Rửa cây lăn trong nước ấm và để cho khô.