After some time, unfortunately, are deposited residues of the apple juice in the Siggflaschen. Some time it worked to remove the residue with a bottle brush, but eventually the residues were too persistent. We have now attempts to purification tablets and are very satisfied. Leave but they have longer a priori act (just a few hours dringelassen), rinsed and leave for another tablet. For safety's sake again using the bottle brush and lo and behold - the bottles are clean again beautiful!
