Sử dụng phương pháp đơn giản này cho vải lanh và cotton. Lật mặt sau của vết bẩn. Xối nước lạnh lên vết bẩn. Chà xà phòng lên vết bẩn. Nắm chỗ vết bẩn bằng hai tay. Chà vết bẩn với nhau. Thay nước và xà phòng thường xuyên để tiếp tục chà.

I'm interested in that, but I only have a few mins. Can you give me at most the first 500 characters of a detailed explanation in English about that?
This method requires no special tools, but does take a significant amount of prolonged rubbing. It is especially suited to stains on natural fibres such as linen and cotton. Fabrics whose surfaces fragment into small round surface balls, known as "bobbles" or "pills," require a longer period of more gentle rubbing. These fabrics include wool and most artificial fibres. In this position, water can work at the stain from the back, pushing it outward and off the fabric. Rinsing in this position is