Sweat can leave yellowish stains around the armpits, especially on white T-shirts. This happens when the salts in sweat react with the aluminium salts in deodorant, mixing with your skin and creating discolouration. Left untreated, the stains can work their way deep into the fabric over time.

To tackle sweat stains, make a simple paste from bicarbonate of soda and water, apply it to the stain and leave it for about 30 minutes. Gently rub it in, then rinse with cold water.

For more stubborn marks, try a mixture of vinegar and water (in a 1:1 ratio) or use an oxygen-based stain remover. After treatment, wash the garment as usual, following the care label.

On white clothes, a little lemon juice can also help to brighten the fabric and lighten the stain. Do keep in mind, though, that older stains are much harder to remove effectively.