After you’ve sponged the stain, air out the mattress by leaving it in a ventilated room without any bedding. If this method doesn’t shift the stain, you can try a mixture of half water and half vinegar which you can then spray onto the stain. Dab again with a sponge to remove the staining. Vinegar can leave a lasting smell, so if you find this happens try sprinkling some baking powder over the area. You can try a mixture of half water and half vinegar which you can then spray onto the stain (Image: GETTY) Leave to soak up the smell, and then hoover off to remove the powder.