Tired-looking trainers are a weak link in any look. There’s nothing more deflating than thinking you’ve got your 'fit nailed, only to look down and see the evidence of last weekend’s club-floor quagmire on your toes. But don’t be so quick to send them on their way to the big sneaker stash in the sky. Follow our step-by-step guide to giving your kicks a clean-up and have them back to boxfresh in no time.