Làm sạch khe gạch bằng hơi nước. Xử lý khe gạch bằng muối nở và giấm. Chuyển sang dùng muối nở và ô xy già. Thử dùng hàn the và nước cốt chanh.

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?
One effective and environmentally friendly way of cleaning grout is to attack it with a steam cleaner. Outfit your steam cleaner with a thin and pointed nozzle, and a brush attachment if it’s available. Aim the nozzle at the grout lines, apply continuous steam, and follow the grout lines with the steamer. Even if the steam cleaner doesn’t get the grout perfectly clean, it will clean it somewhat, and help loosen the rest of the dirt and debris to make it easier to clean with other products. Take