i have the answer for you!
Miltons!
its a anti-bacterial/anti-fungal disinfectant thing for baby's stuff, like bottles etc.
it doesnt go cloudy in water and doesnt harm plastics either. so its ideal
i dont know if you can get it in sweden, but i think you can (according to my mum) you should be able to buy it in most good chemist's like Boots. if not, find out if they have other stuff for sterilising baby utensiles and bottles.