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Five boys in blue caps and t-shirts sitting arm in arm on a bench by a baseball pitch.

How to Wash a Peak Cap

Washing your children's peak caps may seem slightly challenging but, with the help of OMO Laundry Liquid and our laundry tips, it is actually really easy.

Step 1: Deciding How to Wash Your Cap

Assess your hat.

First, you will need to look closely at your cap to determine whether or not it can be washed and what is the best approach to go about it.

  • Look carefully at the material, stitches, and the brim. If your hat is made with good quality materials, is relatively new, and has solid stitching you should be able to wash it without any trouble.
  • Look for signs that the hat is inexpensive or poorly constructed. If the cap has loose stitching or a cardboard brim, it might fall apart if you wash it. If the hat was inexpensive, it might make more sense to replace it rather than to attempt to wash it.
  • Look for signs of age. If you your cap is very old, you should take extra care and only wash it by hand.
  • Check for a tag. A tag on your peak cap should have washing instructions and other information about the material. Follow the washing instructions if the manufacturer included any on the tag.
  • Determine the kind of fabric. If your hat is made from cotton, polyester, or twill and is well made you should be able to wash it. If the cap is made from wool, you should only hand wash it using special a detergent designed for wool.

Step 2: Washing by Hand

Check your hat for colourfastness.

If your hat is made from a delicate fabric, or if it is an older hat, you need to make sure that washing it won't remove or change the colour.

Use a very small amount of OMO handwash liquid on a rag or washcloth and rub it on a small area on the hat. Choose an area on the inside part of the hat that is hidden when wearing. Rinse it gently with cool water. If the colour stays the same, you can wash the rest of the hat.

  1. Spot clean your hat. If there are stains or very soiled areas on your cap, spray them with stain remover or a laundry pre-treatment. Let the stain remover sit for a few minutes, then rinse the areas with water.
  2. Fill a sink with cool water. Put a little bit of OMO handwash liquid in the sink as it fills.
  3. Dunk the cap into the sink of soapy water and use a cloth soaked in the soap and water to rub the surface of the cap. Repeat this step as needed.
  4. Rinse the cap in cool water until all of the soap is removed.
  5. Allow the cap to air dry. It's important to make sure that the hat keeps its shape while drying. Pay special attention to the shape of the brim. Make sure that it is formed into the shape that you like best while it is drying.


  • Don't use too much soap. If you do, the hat can retain some of it. Make sure that all of the soap is rinsed out of the fabric before drying.
  • Only use liquid detergent.
  • Don't use bleach or detergents that contain bleach. These will discolour your hat.
  • Don't dry your hat in the sunlight, it might cause it to discolour.

Click on the link for more laundry tips.