It's a good thing i went to JW Dover (my lhbs) today in Westlake. The brewer had a slack moment & walked out with the clerk to rap for a bit. So we got to talking about the better bottle I'd traded. He said he used to use'em in the brewery (Black Box Brewing Co.),& he said it's caustic cleaners that're causing the better bottles to crack. Which includes,unfortunately,my beloved PBW.
I told him I use 1.5oz in a gallon of water for general cleaning,& 4TBSP in fermenters filled with cold water to above the crud ring. He of course said caustic cleaners work better when hot. He also said at the amount I'm using (which is normal average cleaning strength according to Fivestar),was "pushing it" in regard to the better bottle cracking thing.
And instead of soaking them 5-7 days & a light scrubbing,he said it'd last longer if I used a lighter cleaner strength & more scrubbing to prevent it from weakening & cracking.
As we discussed it,he remained adamant about his convictions. So I thought this was of milestone importance to tell my "other family" about his findings!
Now here's the kicker...He had a discussion with the owner of the company that makes the better bottles about this,the guy,needless to say...was quite arrogant as he said,about the product & my man's findings. So he quit carrying them. But he also said,with a seriously introspective face & tone,that he was trying to think of a cleaner,or way to clean them that would be safe & prevent the cracking bit. I'm gunna hang around there more often & see if I can help him the way I help you folks...Idk...hopefully something will come to me. I sincerely hope so...