Bottles are often sterilised using UV if they're intended to be food safe. I looked into this for goldilocks bottles but UV isn't great for silicone hence the autoclave.

 

I wash all my bottles..also I have noticed since I ventured into the world of diy mixing I throw no bottle of any shape or form away..reuse and recycle

 

Yes correct it will be food grade, I'm not saying you should wash new bottles for health reasons I'm saying you should wash them to avoid ruining flavour.
I would say most residue is gathered whilst moulded into a preform before it even reaches
the blowing machines.
I would of often used a freshly made bottle for water to drink and if I didn't clean it the taste of residue left on the plastic was really bad even giving the bottle a quick rinse wouldn't get rid of it completely.

 

Can you confirm that there should be no risk of loose plastic residue inside the bottles? Thanks.

 

Extremely unlikely pal but not impossible.

 

I bet there’s someone out there that gives them a whirl in an ultrasonic cleaner.

 

I give mine a quick rinse when I get them. Mainly because the first lot I bought were all covered in a fine layer of dust. Dunno if it was leftover from the manufacturing process or whether it was just because they had been sat on the shelf for a while, but they came without lids so I didn't really fancy vaping it.

 

If someone is feeling lazy I’ll trade my washed empty ones for unwashed full ones

 

that would be me, mostly to show the missus that the vape paraphernalia is money well spent usually with rdas and other bits in there too though