1, old cotton trousers can be washed. Read the label on the trousers carefully to see if there is a washable mark. If it is not washable, send it to the dry cleaner for washing; If you can wash it by hand (never wash it with a washing machine, or it will shrink).

2. Cleaning method: put the cotton trousers in a basin and soak them in clean water for about 7 or 8 minutes (the natural water temperature is good, so don't use hot water, which will make the house melt into the cotton trousers and burn the trousers), then take them out and put them in detergent, stir them evenly, and put them in cotton trousers to make them fully contact with the detergent and soak them for about 7 or 8 minutes (note, if you can't soak the washing instructions, press. Then wash the solvent off the cotton trousers repeatedly with clear water, and it will be cleaned after about 3 to 4 times. Finally, wring out and dry.