@centex99: Dishwasher should be fine. I always use starsan. Once dipped for a few minutes, drained (not rinsed!) and sealed, they should stay sanitary inside. If you can store them upsidedown even better. If you are concerned with contaminants penetrating the non-removable rubber seal, you can purchase the swing lids from a homebrew supply store. They are standard size. The swing lids come without the seals which can also be purchased separately.
Sometimes, the Flensberger bottles have the removable seals. Easiest way to tell is the seal is a brighter red and looks thicker than the other permanent seals. Im not worried though. The permanent seals have never given me any problems as far as sealing or contamination. Keep an eye on them for mold buildup. Once you see that, toss em out.
-TxT
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