Can you just soak your baubles in gin? Or should you buy an ultrasonic cleaner? Our jewellery specialists advise on the best ways to put the sparkle back into your gems Homespun remedies for cleaning jewellery abound — gin being a widespread favourite, closely followed by toothpaste, and even the liberal use of saliva. Not surprisingly, none of these are the best method for ridding your jewels of grease and grime, although that doesn’t mean you have to go high-tech.