StarSan Etching In Carboy?

i started storing my carboys with a little bit of starsan in them per several people's recommendations...i lay them on their sides (in boxes) so i can put them on shelves. after a brewing hiatus of a year, i got them all out and they all have no liquid in them...but all of them are cloudy/hazy where the starsan would have been pooled up. i tried soaking them in oxy for a day to remove the "stain": no luck. i tried scrubbing them with a carboy brush: no luck. does starsan etch glass at the proper concentration?...

...i'd like to get the carboys "clean" again but in the case that they are etched/stained on the interior from the starsan, can i still use them to ferment in? i will no longer be storing my carboys with any liquids in them...

Try rinsing them out with something mildly acidic, like vinegar or star-san. I know it seems counter-intuitive, but if it's not etching it may work.

Maybe soak with oxyclean overnight, then wipe with a rag? (Stuff a wet rag in there and slosh it around...)

I'd bet it's etched. Evaporation=concentration. The concentrated phosphoric acid more than likely did etch your carboy. JM2C