Bests & Worsts Reviews from Amazon

These eco-balls have been tested by consumer associations and the result was that they're not more effective than washing with water only. Try it yourself before buying. The thing is that most clothes aren't much dirty anyway so detergent is only necessary for stains. The manufacturers of these eco-balls recomend pre-treatment with detergent for stains, meaning they don't work for stains. Clothes and dish detergents are a huge market and generate billions in sales and advertising. Doesn't really surprise me finding out that they're far less necessary than advertised. You might want to check the test results by consumer associations of several countries: (google for "sopadabola wordpress" - can't put links here. In the main page there is a link to view the page in English)