Home improvement tip

I was watching BBC America's programme, 'How Clean is your Home?'
They gave a tip about maintaining our dishwashers.

Pour one cup white vinegar in your dishwasher, and run it on normal wash. Do this once a month to keep your dishwasher clean, and grease free.
NOTE: Do not put in any dirty dishes. It should run empty.

As I write this, my dishwasher is already slish-sloshing. So will tell you guys next time, if I feel this tip worked for my dishwasher.