We bought a used ball pit from eBay for my daughter's birthday party and naively didn't think about a kids item having been around smoke. It stinks of stale smoke and is unusable. I've tried cleaning the plastic balls with white vinegar which has reduced the smell but it's still clearly there. We spent quite a lot on it and can't really afford to take the financial hit. Does anybody have any experience getting cigarette odours out? Any ideas would be gratefully received.