Mix 1 tablespoon of laundry detergent with 1 cup of warm water. Dip a toothbrush into the solution and then use it to scrub at the yellow stains in a circular motion. Repeat until the stains disappear. Rinse the shoes and let air dry.

In the last few months, I've taken my white sneakers to England, Scotland, San Francisco and beyond, and while my shoes got me around the world comfortably, my once pristine white shoes are now a dishwater gray.

This £2.50 household product is the key to making your white shoes look as though they are brand new. Whitening non-gel toothpaste from Colgate, which can cost as little as £2.50 from major supermarkets like Asda, is exactly what you need to stop your white trainers from looking dull and grey.

Running can be hard on your body, especially your joints and muscles. Running is also hard on your shoes. Over time, pounding the pavement, hiking trails and treadmill takes a toll on your footwear, wearing down the soles and reducing traction.