MICROWAVE!  And the garbage disposal.

Ever end up with old, withered, tired looking citrus in your fridge? Perk them up and get a bit of juice out of them by putting them in the microwave for 10-20 seconds.

But if that citrus is too far gone, cut it in half or in quarters and drop it down the garbage disposal.  The tough rind will take a while to mince up, helping to dislodge any other yuckies down there. With the added benefit of a pleasantly fragranced sink, that tired old piece of fruit does double duty for you.