Sarah Michelle Gellar and Freddie Prinze Jr have teamed up with American dishwasher detergent brand Cascade, launching its Do It Every Night campaign, encouraging water conservation by asking people to 'consider running the dishwasher every night, instead of washing dishes by hand'.

The Buffy The Vampire Slayer star said 'We used to feel guilty about running the dishwasher before it was full, so we’d end up washing dishes by hand, waiting for the dishwasher to fill up. Now that we know that we can save up to 100 gallons of water a week by skipping the sink and running our dishwasher at the end of the day, we’re doing it more often to help save water'.