How to Clean a Wool Blazer Without Wrecking Its Shape

A blazer is built – which is why the machine ruins it

A blazer is not just a layer of wool. Inside sits a canvas or fused interfacing across the chest, often shoulder pads and a lining, all shaped and pressed to hold a three-dimensional form. Put it in the washing machine and the wool, canvas and lining shrink at different rates, the shoulders lose their form and the jacket hangs crooked forever. That is why a structured blazer is a garment you care for and spot-clean, not wash – exactly like a suit jacket.

How to keep the blazer fresh between cleans

Wool is self-cleaning and rarely needs more than a little care after wearing. This routine covers most of it and noticeably extends the blazer's life:

1. Brush the jacket top to bottom with a soft clothes brush after wearing, lifting dust and crumbs before they embed in the weave.
2. Hang the blazer somewhere airy for a day before it goes back in the wardrobe, and rest it between wears so the wool recovers.
3. Steam out creases and odour – hang the jacket and steam it vertically from the top, without crushing the roll of the lapel or pressing the collar flat.
4. Spot-clean fresh marks straight away: blot with a damp, clean cloth, and put an absorbent powder such as talc or cornflour on grease before you brush it off.
5. Always test a hidden spot, like under the collar, before using moisture or any product – and never rub wool hard, as it goes dull and fuzzy.
6. Hang the blazer on a broad, shaped hanger that supports the shoulders, so it holds its shape between wears.

Spot-clean a mark without cleaning the whole jacket

Most marks on a blazer are small and fresh, and then spot-cleaning is the right answer – not a full round. The key is to work gently, from the outside in, so you do not spread the mark.

• Grease and oil: apply talc or cornflour straight away, let it draw up the grease, and brush it off. Repeat before you try anything wet.
• Water-based marks: blot lightly with a barely damp cloth from the edge inward – wool water-spots easily, so do not soak it.
• Dry dirt and dust: let it dry and brush it out rather than rubbing it in wet.
• If the mark stays, has spread, or you are unsure of the fabric: stop, and let a professional take it before you make it permanent.

Unlined and soft blazers – check the care label

Not every blazer is equally structured. Some summer blazers and 'unconstructed' models are sewn with almost no canvas or lining, and a few are labelled for hand-washing or a gentle machine wash. Then the label rules, not the rule of thumb: a wash tub means the garment can be washed, a circle means professional cleaning. If the blazer is soft, unlined and marked washable, you can hand-wash it cold with wool detergent, squeeze the water out in a towel and dry it flat in shape. If you are at all unsure whether the jacket is structured, treat it as a blazer that should not go in water.

When the blazer should go to a professional

Send the blazer in when it has a mark that has set, an overall greyness or odour that airing and steaming will not shift, is marked 'dry clean only', or is going away for a season – it should be cleaned first, since sweat and food residue attract moths. A professional cleans wool gently without washing the shape out of it, and presses the jacket back into form. If the blazer is part of a suit, we clean it together with the trousers so the colour stays even, and if it needs taking in at the waist or the sleeves shortened, we can do that at the same time. You order online, and you see the price before you order.

Frequently asked questions