The bird is now bones, the gravy glue, the roast veggies are on their way to becoming a source of winter fuel and as soon as everyone’s dinner has gone down a bit, it will be time to do the washing-up. If you are one of the 64 per cent of households in the UK that doesn’t own a dishwasher, chances are there will be a trusty bottle of Fairy Liquid by the sink to get the job of washing-up done.