Always have some Bicarb of soda in your cupboards. It has so many uses, from cleaning sterling silver to getting rid of strong smells in your fridge and trainers. And it's kind to the environment.
To clean silver make a paste with bicarb and water and use a soft cloth (not paper as that can scratch).
To get rid of the smell in your trainers just sprinkle some in, and when you next want to wear them, just tap it out.
