How can you get the menthol smell out of bottle so you can reuse
Try grain alcohol (everclear), white rum, or vodka. If that doesn’t do it then you will probably have to dispose that bottle…
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Or reuse it for Menthol 
I don’t use Menthol anymore, but for nasty stuff I put it in hot water with dishsoap, then hot water with vinegar over night, then give it the alcohol tretment.
Got everything out here so far 
PS: I even reuse flavour bottles XD. I like our environment
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Didn’t think about the Vinegar. Cure all for anything…lol
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After washing rinse then fill bottle with natural lemon juice and leave overnight.
Works for me.
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Beautiful puppy pic 
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Diluted vinegar soak or baking soda solution soak. If neither of those work, nothing will. Had a 60ml bottle with spearmint in it at one point, reused it for @RocketPuppy’s Y4 and it ruined the RY4. I was sad. I tried to bring myself to vape it anyway but I wound up having to toss it and start fresh. If there’s even a hint of a smell after washing a bottle with warm soapy water, I toss it.