If there are magnets for refrigerators, then why not for dishwashers? The Black Flip Side Dishwasher Magnet from Fred & Friends is a reversible magnet with two messages. One side of the magnet has a sign that goes, 'Come in, we're clean' to indicate the dishwasher is free. The other says, 'Sorry, we're dirty' to indicate that there are dirty dishes to be cleaned.
This sign even works with stainless steel dishwashers. It included is a small magnet with a sticky back that you can stick onto your stainless steel dishwasher and the magnet sign will stick to this magnet. No excuses for not using this handy sign.