Magic Copper Balls For Cleaning Vases and Decanters 5 "Tiny little wonders!" Mrs Ashurst 10 October 2016 Used the magic balls to remove some oo-nastiness gunked in a small china vinegar bottle. I put about a quarter of the ballss into the bottle with a drop of washing up liquid and warm water.holding the stopper in place, I shook the thing for less than a minute. I checked the inside and there was a foamy brown liquid; the balls having dislodged the gunk. Great stuff! Now, how to catch the little blighters when rinsing out the bottle? Solution? Catch 'em with a tea strainer! Works a treat!. Rinsed out the clean bottle and tipped the balls from the strainer onto some kitchen towel to dry. Job done.