Has anyone any idea how to clean laser cut sparkle tubes, I've made a few necklaces using the Cooksons laser cut frosted or sparkle tubes and beads but when they tarnish they don't clean up but go a dull grey colour, I'm only leaving them in the silver cleaner for a couple of minutes, the rest of the necklaces are Swarovski crystal, silver squares and nylon coated beading wire, can't remember the make off hand, I'm tempted to deconstruct and treat them to some platinol or liver of sulphur.