We.. or should I say the wife got some eco drier balls about a year ago...they did what it said on the box and reduced the drying time by half...the only downside was the noise they made as they trundled round the tumpble drier...they sounded like half bricks in an empty cement mixer.
These raised the interest in the Eco wash balls....so she got them (Eco not copies) for about £20 on eBay...I encouraged her to get them as we spend about £10-15 a fortnight on washing liquid.
We were'nt surprised to find out these also work well...dont expect them to remove heavily stained or really dirty washing...you need to apply a stain remover first.
But for most of our everyday washing, they worked well....the washing comes out clean but it does'nt smell of anything, that is quite strange when you are used to smelling the fagrances that are added into most detergents.
I was not so much interested in saving the planet, but more interested in saving a good few quid..!
So in our case they paid for themselves inside a month....if you do get some dont go for the cheap alternatives... get the real ones.
http://tinyurl.com/yas5ypn