I think if I had bins that were starting to smell a bit high, I'd probably spend the ?20 to save myself the bother. It's not like you'd be doing it every month, once or twice a year probably enough for a "deep clean". One thing I like about living on an estate as I now do, is that they have several of those big metal skip bins, so you just chuck everything in there and forget about it. Only downside is that although I chuck recycling stuff in the one marked for recycling, I suspect others don't bother so most of my beer cans probably end up in landfill.