First, read the English article below.

Hot water is ideal for removing stains from fabric, but it can destroy a sweater. Because of this, you will need to take extra steps to remove oil stains from sweaters. Here is a list of what you will need:  Cornstarch Dish soap Cold water Sink or tub Sheet of paper larger than the sweater Pencil or pen Large towel Again, resist the urge to wring or twist the sweater. Simply let the water drip out of it. If you got a woolen skirt, suit, or pants stained with oil, try using a solution made from 1 part dish soap, 1 part white vinegar, and 6 parts water. Cover the stain with the solution, and tap it gently with an old toothbrush. Wait a few minutes, then blot everything dry with a clean towel. Clean off any residue by tapping the area with a damp towel. Finish by dabbing the area dry with another dry towel.  You may need to follow up with the washing instructions on the care tag. This means that you may need to take the sweater to a dry cleaner, hand wash it, or put it in the washing machine.  Do not leave this solution for too long on the wool, or you may discolor the fabric. 

Now, please write a short abstract for it in Vietnamese. Abstract:
Thu thập vật tư. Ngâm áo len khoảng 2-3 phút trước khi lấy ra. Biết cách xử lý các loại trang phục len khác.