When the world gives you lemons...

Make lemonade... or alternatively you can:

1. Cut them in half and use each side as a scrubbing sponge to clean discoloured ceramic sinks. (Just tried it - it really works!)
2. Squeeze the juice of half a lemon into 2 cups of water and pour into your kettle. Boil the solution and then let it cool entirely before emptying to descale your kettle. (Worked fairly well, but probably needs a second round!)