I’m a newbie, but frequently reused plastic bottles before DIY. Did a hot water rinse, dry and reused. The only precaution I used was reusing them for similar tasting flavors. It worked well for me. Because I am new to DIY, I have ordered a number of 30ml and 60ml plastic bottles to get started. In the last month, I have about 20 flavors either in use or steeping. As I modify my recipes, I will reuse the same bottles, but with new labels.
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/problem solved
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I’ve read numerous times to use Cold water to rinse. Heat makes the porous plastic expand which can allow flavor molecules to become trapped in the wall of the bottle.
Many do a final rinse with Distilled Water to avoid hard water stains.
I’ve used just cold water and had mostly good outcomes with LDPE and PET. LDPE is the most porous and so is the toughest to rid of the previous flavor. Any sticky flavors, i would just take the loss and toss the bottle. Or, reuse with like-flavors, as mentioned above!
I don’t mess around with rinsing now, and just recycle most of my used bottles after 1 use. Cleaning 20+ bottles (+tips and caps) at a time was freaking tedious. I got tired of it and now order by 100ct boxes from dropperbottles.com.
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This works in any situation 
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I’ll have for sure have to get one
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They’re handy little boogers! 
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except for those that could kill themselves with a rusty spoon.
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I use hot water only, then if you want to then use Miltons tablets. It kills any bacteria and viruses, I mean they use it to sterilise baby bottles. It also doesn’t leave a taste behind. It is cheap, and you use a tablet to wash a ton of bottles.
Also, stick to your flavours, so if you made a menthol in a bottle, don’t use the same bottle next time to make a custard. If I make the exact flavour, I don’t even bother washing the bottle. Just rinse.
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I reuse the 500ml VG and PG empties for the favorite mixes. Because it’s only VG/PG, I don’t rinse them out and I’ll refill the bottle with the same juice mix after a quick rinse. I reuse my 50ml empties with the same mixes as well. Because those get open/closed more often and are in backpacks/pocets etc, I usually let the caps and tips soak in mild detergent and rinse/dry.
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I reuse plastic commercial bottles but I only have a few as I wasn’t smart enough to save before I started diy’ing. My son still buys commercial but whenever he finds a good one he likes he will save the bottle for me and I’ll reuse it to mix similar flavors for him. All empty plastic bottles I buy/bought I do reuse. Sometimes I don’t wash them out, ie: if I just finished a bottle of MMU then I immediately go mix up a fresh batch using same bottle, in these instances I’ll wash every other mix.
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For my larger batches of my favorite mixes I don’t wash the bottles, actually I like to leave 10-20% of juice in the bottle and add to that when I remix the same recipe. It’s called seed steeping, which I didn’t even know was a thing until @SessionDrummer brought it up in another thread awhile back.
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I lost my bottle opener tool about a year ago, decided to order a new one last week. Murphy’s Law - I found my old one 2 hours after placing the order! 
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Sounds about right…
/smh and laughing
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Yep, but if you hadn’t ordered a new one, the original one would not have appeared. It’s magic !!
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So true!!! 
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BREAKING NEWS !
I just threw out my very first juice bottle. it was leaking in the middle = i am sure you know what i mean.
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It works … I bought 2 …(I tend to lose things) I do notice the tops that have a thicker base (where the opener lifts from) open much easier then the thinner base… The thinner ones kinda look chewed up… But a thin razor blade inserted between the base and bottle come off with a twist of the blade…
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my husband has been able to fit his finger nail under the edge as they’re just pressure fitted
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I know I been using hot water
Tiny bit of dish liquid an now been using adrop of"goo gone"
For the outside rinsing well of course
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