Ripped Lids

Chapter 06 of 07

Cleaning caps and hats without ruining their shape

A cautious, step-by-step approach to cleaning caps and hats: testing first, spot cleaning, hand washing, sweatbands, felt and straw, and drying in shape.

Published 2026-10-22. An automated check requested each cited document once on 2026-10-22; several publishers' sites did not return a readable page to it, and a line-by-line check against their current text is pending.

An illustration of a cap drying upside down over a rounded form beside a shallow basin of water.

Start with the label and a test

If your hat has care instructions, they come first. The FTC's guidance on the Care Labeling Rule explains that a care label gives at least one regular method the maker has a reasonable basis for, plus warnings about steps that would harm the item. The American Cleaning Institute's guide to care symbols explains how to read them. Chapter 05 covers both in detail.

Many hats have no care label, because US rules treat items worn only on the head as outside the Care Labeling Rule. In that case, the methods below are general practice, ordered from gentlest to most aggressive. Before using any of them on a visible area, test on a hidden spot such as the inside of the sweatband: dampen a white cloth with the cleaning solution, press it to the fabric, and check the cloth for colour and the fabric for marking once it has dried.

The cleaning ladder

A useful way to think about cleaning hats is as a ladder. Start at the bottom and only climb as far as you need to.

  1. Brush. A soft clothes brush removes dust and loose dirt. For felt, brush in the direction of the nap, the way the surface fibres lie, which on many felt hats runs around the crown.
  2. Lint roller or sticky tape. Lifts hair and lint without moisture.
  3. Spot clean. A cloth or soft brush with a little mild detergent solution on marks and the sweatband only.
  4. Hand wash. The whole cap in a basin of cool water with mild detergent. For washable fabrics only.
  5. Machine wash. Only when the label allows it, or for sturdy unstructured caps you are prepared to risk.

Felt and straw hats generally stop at step 3. Structured caps with card peaks also stop at step 3. Cotton, denim and synthetic caps with plastic peaks can usually go to step 4.

Spot cleaning and sweatbands

The sweatband is where most of the dirt on a cap collects: sweat, skin oils, sunscreen and hair products. Cleaning just the band often refreshes a cap enough that a full wash is unnecessary.

  1. Mix a small amount of mild liquid detergent into a bowl of cool water.
  2. Dip a soft toothbrush or cloth in the solution and shake off the excess.
  3. Work along the sweatband in small sections with gentle strokes. Do not scrub hard on printed or distressed areas.
  4. Wipe with a second cloth dampened with clean water to remove soap.
  5. Blot with a dry towel and leave the cap to dry in shape (see below).

For marks on the crown, work from the outside of the mark inwards to avoid spreading it, and dab rather than rub on dark or distressed fabric to limit fading.

Hand washing a cap

For cotton, denim and synthetic caps with plastic peaks and no leather parts, hand washing is the most controlled full clean.

  1. Fill a clean basin or sink with cool water and a small amount of mild detergent. Avoid bleach unless the label allows it.
  2. Pre-treat the sweatband and any marks as above.
  3. Submerge the cap and let it soak briefly. Soaking for long periods is more likely to soften stiffeners and loosen glues.
  4. Agitate gently with your hands and use a soft brush on the band and marks.
  5. Rinse in clean cool water until no suds remain.
  6. Press out water with your hands or roll the cap in a towel. Do not wring or twist it; that bends the peak and distorts the crown.

Wash dark, red or indigo caps on their own the first few times. Colour that comes out into the water is a sign the dye can move, and it can stain lighter items.

Worked example

An imaginary reader has a navy cotton cap with a plastic peak and a grimy sweatband. They brush it, spot clean the band, and look again: the crown is fine, so they stop there. A month later the whole cap smells stale after a hot summer, so they hand wash it once, alone, in cool water, and dry it over a rounded bowl. The colour holds and the front keeps its shape.

If you use a machine

Some caps are labelled machine washable, and some people choose to machine wash sturdy, unstructured caps anyway. If you do:

  • Use a cold, gentle or delicate cycle. On care symbols, bars under the washtub mean a gentler cycle (see chapter 05).
  • Put the cap in a mesh laundry bag or use a cap frame designed for washing, to protect the peak and crown.
  • Wash with similar colours and light items only, not with heavy items such as jeans or towels that batter the cap.
  • Do not tumble dry.

Cold water is kinder to most hats: it is less likely to shrink wool, soften glues or warp a stiffened front.

Dishwashers are sometimes suggested for cleaning caps. This handbook does not recommend it. Dishwasher detergents are made for dishes rather than fabric, and the heat of a dishwasher cycle is the kind that softens synthetics, shrinks wool and loosens glue.

Drying in shape

How a cap dries decides what shape it keeps. A cap left in a heap dries in a heap.

  • Support the crown. Dry the cap over a rounded form roughly the size of a head: an upturned bowl, a balloon, a rolled towel or a purpose-made form.
  • Shape the peak. Smooth the peak into its curve, or flat, as it was. For a curved peak, resting it against a curved surface while drying helps.
  • Air, not heat. Dry at room temperature with air moving around it. Avoid radiators, hair dryers and direct strong sun, which can fade colour, warp stiffeners and shrink fibres. Polyester and nylon soften under high heat, as Britannica's entry on polyester notes.
  • Dry fully. The US Environmental Protection Agency's guide to mould and moisture stresses that moisture control is the key to mould control and that damp materials should be dried promptly. A cap put away damp, especially with a thick sweatband or foam front, can develop a musty smell or mould.

Felt, wool and straw

These materials need different handling.

  • Felt. Brush regularly with a soft brush. For a mark, a slightly damp cloth or a felt-cleaning sponge used lightly is the usual first step. If a felt hat gets wet in the rain, shake off the water, keep the crown full with tissue, and let it dry at room temperature resting on its crown or on a hat stand, not flat on its brim. As Britannica explains, wool fibres lock together with moisture, heat and movement, so a felt hat should not be soaked, scrubbed or heated.
  • Knitted wool. Hand wash only if needed, in cool water with a detergent suitable for wool, with minimal handling. Press water out in a towel and dry flat, reshaping it gently.
  • Straw. Brush or wipe with a barely damp cloth. Do not soak straw; it can lose its stiffness and shape. Let any damp area dry at room temperature with the crown supported.
  • Leather sweatbands. Wipe with a barely damp cloth and let them dry naturally. Do not soak them; leather can stiffen and crack.

For valuable, old or sentimental felt and straw hats, a specialist hat cleaner or a textile conservator is usually the safer choice than home cleaning.

Things to avoid

  • Hot water, hot dryers and hot irons on any hat without a label that allows them.
  • Chlorine bleach on coloured, wool, felt or synthetic fabrics, or anywhere the label shows a crossed triangle.
  • Wringing, twisting or folding the peak.
  • Soaking caps with card peaks, felt, straw or leather parts.
  • Storing a hat before it is completely dry.

Next chapter: Storing hats: shape, light, damp and moths