The hard collar of the shirt is mostly made of linen and resin linen. To wash the hard-collared shirt, you can first add water to the washing powder and make it into a solution, and then put the wet hard-collared shirt into the washing powder solution and soak for fifteen minutes. If the shirt is dirty, the soaking time can be longer, then rub it gently with your hands, or gently brush it with a brush to remove dirt. If the collar is too dirty, you can apply some soap or sprinkle some dry washing powder and rub it gently. After washing, rinse with clean water, take it out and dry. Be careful not to twist it to keep the collar firm and not wrinkle. When washing pure wool blankets, first dissolve the neutral soap slices with boiling water, then add a tablespoon of borax to the soap solution. When the temperature of the soap liquid drops to around 60℃, put the blanket in and soak for 3-4 hours. During soaking, you can gently rub and wash the contaminated areas with both hands. If it is not washed clean, add two tablespoons of turpentine oil to soap and mix into a milky shape for washing. After washing, rinse it with warm water to make it dry naturally. When most of it is dry, use a non-hot iron to iron it with a sheet and then dry it a little to disperse the water.