I bought a large canning style jar with a wire close lid from Goodwill. It appeared clean (and newish), but I washed it with Dawn and hot water anyway. As it was upended in the dish rack I noticed that the water was separating off the glass in a way that indicated some sort of residue was on the interior. The water was not draining normally.
Bleach did not solve the problem. I can't seem to abrade it (to make it visible) yet I can find no way to get rid of it either. It's going in the recycling. I've had drinking glasses every now and then, also second hand/vintage, that have occasionally had the same issue, I've thrown them out. It's not cloudy, it is for all intents "invisible" until washed, and then you notice the draining water is behaving differently.
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Dawn is an excellent grease cutter. Maybe you have to soak the glass awhile. You can also try Barkeepers Friend.
I recently read that by microwaving (or I presume stove-top warming) lemon juice or lemon peels in water, this liquid will cut any & all grease
I can't wait to try it next
It is possible the previous owners used them for something other than their intended purpose and damaged the finish.
Do they have the maker on them? Like if they are Ball/Kerr, I would call the company and get their take: This is the Ball contact info
www.freshpreserving.com/
Having got really sick from canned products in the past, I am leery of everything related to jars and the process (it was my mistake so I can't blame anyone but me). That is why I always preach safety first and go right to the source...in your case, the company that made the jars.
Good luck!
PS if nothing else, the jars are great for displaying buttons, colorful threads and shells! I love using them for buttons!
This sounds strange as you say it is not a greasy film.
I would try something like Softscrub or Barkeepers Friend with a nylon scrubber just to see if it helped.
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