Please see few tips for the cap cleaning.

• Steam from a household kettle and a hat brush will help banish any dust and dirt from tweed. Brush the hat using short strokes.
  
  
• For stubborn marks, lighter fuel or dry cleaning fluid can be used. Ensure these liquids are used in a well-ventilated room and always test a patch first - we recommend the inside of the cap or hat.
  
  
• Dry a tweed cap or hat by shaking off the water and leave at room temperature. 
  • Never dry a tweed cap or hat on a radiator, as the heat will shrink the fibers and cause your cap or hat to decrease in size.
• Should your tweed cap or hat shrink in size, a hat jack can be used to stretch it back to its original shape.
  
  
• Tweed-brimmed hats can have their brims straightened by ironing on a low setting, over a damp cloth.