Average use: Less than once a year or never
Cost: We found one for £20.84 on Amazon
Cost per use: £20.84
goodtoknow verdict: waste of money
Where to next?
Energy bills - how much do your appliances cost?
More ways to save on household bills
Don't miss today's deal of the day
- Tested: Best and worst sun creams
- What celebrities really eat in a day - revealed!
- Celebrity tattoos
- How to get a cool night's sleep on a hot summer night
- The X Factor contestants: Where are they now?
- Celeb bikini gallery
- 15 bloated stomach causes
- 10 tips for getting rid of cellulite
- Healthy juice recipes: 12 detox juices you can make at home