Ecover laundry bleach will not remove colours, but will help remove stains. Just add a little bit to your powder. I actually use ecoballs and Ecover laundry bleach, and it works great!I always recommend just doing one prewash nefore you use your nappies, but to remember for the first few washes that they won't be fully absorbent. It doesn't seem very eco-friendly to wash them over and over when they've never been used, when you are going to wash them anyway! Just remember that at first they will need changing a little more frequently. If you do decide to do lots of pre-washing, you only need to use powder in the very first wash - after that you can just use the wash programme without the powder, and there is no need to dry between washes either!