by warra48 » Thursday May 24, 2012 2:21 pm
How many times have your bottles been refilled?
Sounds to me like beerstone, which is a hazy calcium deposit on the inside of your bottles.
I get it in mine after a few refills, and just clean it out with some hot water and a bottle rush.
Alternatively, I believe you can give the bottle the sodium percarbonate (napisan) treatment, but I've never done that myself.