An energy-saving device took more gas to boil a pan of water than without it, and supposedly eco-friendly tumble-dryer balls had no effect in tests and did not save time on drying. A peanut butter maker took 20 minutes to produce 40g of the spread – longer than it would take most people to walk to the corner shop for a 300g jar – and was almost impossible to clean. Which? also said consumers should avoid wash balls, designed to clean without detergent, and colour-catcher fabric sheets.
A test of 12 anti-wrinkle eye creams found a £2.98 pot of Simple moisturiser had the same "limited" effect as the most expensive cream. A test of petrol and diesel additives found none made a noticeable improvement to car performance.