I was just very impressed by the very positive Amazon reviews about the product. After 4-5 washes the red Nubsi had faded, the dealer exchanged my Waschball course immediately. But that's about the only positive thing I can report to the product. The new Waschball Although always washed with ... but nothing is happening. I have the following problem: I have some Longsleeves / Shirts with NEM synthetic fiber content. Since these are directly on the skin (eg closer than ne blouse), naturally suck the always pretty full with sweat. Eventually, wear after a few times and wash (I can so a shirt wearing only one day) starts the shirt then to smell musty even during the day, so I constantly a slight smell of sweat on me perceive (other fortunately not, I was assured) , DAS also gets the silver ion ball not under control, too bad. By the way, in case of natural fibers or more adjacent things there no problems: Conclusion: The ball is washed further with because he does not seem to hurt ... and I invest again reinforced in expensive Hess-nature etc. Basic parts "underweare" to. Benefit for me is zero, therefore, unfortunately, only one star!