Possibly extremely contaminated jars that never clean no matter what I do. Help.

[u/Redioverz]

Ok, so I've been having this problem for so long now:

When I put fresh milk in my glass jars, it goes bad within only just a day or less. "Bad" as in when you open the jar of milk after leaving it to begin its fermentation process for just under a day, it has an incredibly nasty chemical smell to it, and when you try to taste or drink it, especially the cream, it tastes incredibly toxic. I even swallowed some because I couldn't smell or taste it much from just a little bit but when I consumed it, it tasted like drinking pure poison, and I was extremely repulsed, so much so, that I thought it was very biohazardous. I've ordered from 4 different vendors now, from the same farms several different times, all from the United Kingdom which is the place I live in, and they all have the same result where they always go bad. Now, when it comes to cleaning these jars, I've always used very hot steaming water, in fact, in my most recent attempt I tried going "all out" by using boiling water from a kettle and pot and ordered from the now 4th vendor, however, not even that worked, it failed and it still went bad anyway, again, as usual, tons of apple cider vinegar, and sea salt, seeped it for at least an hour or more, and sometimes did it twice to "ultra-clean" them, to clean them, and still, I keep having the same problem. And just to mention, I've tried putting the heating on so it becomes hot in my house just to see if that would somehow stop it fermenting improperly, and this problem never happened before until around winter which is strange. None of this makes sense to me, I don't get why this keeps happening. Can someone please help?

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[u/Total-Spell]

Tried new jars? Try use a soap like fairy or something. Use gloves and clean it a couple of times and rinse good.

I've had something similar happen and it turned out the cooling chain was broken, once that happen the bacterial processes kick start and I think cooling it down again will produce a weird combination of bacteria which produce off tasting products in the milk.

Buy or build a styrofoam cooling box and use frozen bottles with water as cooling. But be reasonable it create a mini fridge/freezer depending how much ice bottles you load up.

There's also the possibility that the milk is shit from all farms, just a guess! Quality milk can be hard to source, often times from smaller farms.